fix(#883): use empty list instead of list with empty string

view/view-api/src/main/kotlin/query/data/DataEntriesForDataEntryTypeQuery.kt

@@ -19,11 +19,11 @@ data class DataEntriesForDataEntryTypeQuery(
 ) : FilterQuery<DataEntry>, PageableSortableQuery {
 
   @Deprecated("Please use other constructor setting sort as List<String>")
-  constructor(entryType: EntryType, page: Int = 0, size: Int = Int.MAX_VALUE, sort: String): this(
+  constructor(entryType: EntryType, page: Int = 0, size: Int = Int.MAX_VALUE, sort: String) : this(
     entryType = entryType,
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
   )
 
   override fun applyFilter(element: DataEntry) = element.entryType == this.entryType

view/view-api/src/main/kotlin/query/data/DataEntriesForUserQuery.kt

@@ -30,7 +30,7 @@ data class DataEntriesForUserQuery(
     user = user,
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
     filters = filters
   )
 

view/view-api/src/main/kotlin/query/data/DataEntriesQuery.kt

@@ -26,7 +26,7 @@ data class DataEntriesQuery(
   constructor(page: Int = 0, size: Int = Int.MAX_VALUE, sort: String, filters: List<String> = listOf()): this(
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
     filters = filters
   )
 

view/view-api/src/main/kotlin/query/task/AllTasksQuery.kt

@@ -22,7 +22,7 @@ data class AllTasksQuery(
   constructor(page: Int = 0, size: Int = Int.MAX_VALUE, sort: String, filters: List<String> = listOf()): this(
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
     filters = filters
   )
 

view/view-api/src/main/kotlin/query/task/AllTasksWithDataEntriesQuery.kt

@@ -23,7 +23,7 @@ data class AllTasksWithDataEntriesQuery(
   constructor(page: Int = 0, size: Int = Int.MAX_VALUE, sort: String, filters: List<String> = listOf()): this(
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
     filters = filters
   )
 

view/view-api/src/main/kotlin/query/task/TasksForCandidateUserAndGroupQuery.kt

@@ -27,7 +27,7 @@ data class TasksForCandidateUserAndGroupQuery(
     includeAssigned = includeAssigned,
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
     filters = filters
   )
 

view/view-api/src/main/kotlin/query/task/TasksForGroupQuery.kt

@@ -29,7 +29,7 @@ data class TasksForGroupQuery(
     includeAssigned = includeAssigned,
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
     filters = filters
   )
 

view/view-api/src/main/kotlin/query/task/TasksForUserQuery.kt

@@ -27,20 +27,20 @@ data class TasksForUserQuery(
     assignedToMeOnly = assignedToMeOnly,
     page = page,
     size = size,
-    sort = listOf(sort),
+    sort = if (sort.isBlank()) listOf() else listOf(sort),
     filters = filters
   )
 
   /**
    * Compatibility constructor for old clients.
    */
   @Deprecated(message = "Please use other constructor setting the assignedToMeOnly.")
-  constructor(user: User, page: Int = 0, size: Int = Int.MAX_VALUE, sort: List<String> = listOf(), filters: List<String> = listOf()): this(
+  constructor(user: User, page: Int = 0, size: Int = Int.MAX_VALUE, sort: String? = null, filters: List<String> = listOf()): this(
     user = user,
     assignedToMeOnly = false,
     page = page,
     size = size,
-    sort = sort,
+    sort = if (sort.isNullOrBlank()) listOf() else listOf(sort),
     filters = filters
   )
 

view/view-api/src/main/kotlin/query/task/TasksWithDataEntriesForGroupQuery.kt

@@ -25,7 +25,7 @@ data class TasksWithDataEntriesForGroupQuery(
 
   @Deprecated("Please use other constructor setting sort as List<String>")
   constructor(user: User, includeAssigned: Boolean = false, page: Int = 0, size: Int = Int.MAX_VALUE, sort: String, filters: List<String> = listOf()) : this(
-    user = user, includeAssigned = includeAssigned, page = page, size = size, sort = listOf(sort), filters = filters
+    user = user, includeAssigned = includeAssigned, page = page, size = size, if (sort.isBlank()) listOf() else listOf(sort), filters = filters
   )
 
   override fun applyFilter(element: TaskWithDataEntries): Boolean =

view/view-api/src/main/kotlin/query/task/TasksWithDataEntriesForUserQuery.kt

@@ -25,15 +25,15 @@ data class TasksWithDataEntriesForUserQuery(
 
   @Deprecated("Please use other constructor setting sort as List<String>")
   constructor(user: User, assignedToMeOnly: Boolean = false, page: Int = 0, size: Int = Int.MAX_VALUE, sort: String, filters: List<String> = listOf()) : this(
-    user = user, assignedToMeOnly = assignedToMeOnly, page = page, size = size, sort = listOf(sort), filters = filters
+    user = user, assignedToMeOnly = assignedToMeOnly, page = page, size = size, sort = if (sort.isBlank()) listOf() else listOf(sort), filters = filters
   )
 
   /**
    * Compatibility constructor for old clients.
    */
   @Deprecated("Please use other constructor setting the assignedToMeOnly.")
-  constructor(user: User, page: Int = 0, size: Int = Int.MAX_VALUE, sort: List<String> = listOf(), filters: List<String> = listOf()) : this(
-    user = user, assignedToMeOnly = false, page = page, size = size, sort = sort, filters = filters
+  constructor(user: User, page: Int = 0, size: Int = Int.MAX_VALUE, sort: String? = null, filters: List<String> = listOf()) : this(
+    user = user, assignedToMeOnly = false, page = page, size = size, sort = if (sort.isNullOrBlank()) listOf() else listOf(sort), filters = filters
   )
 
   override fun applyFilter(element: TaskWithDataEntries): Boolean =