Merge pull request #1286 from dhis2/androsdk-1163

fix: [ANDROSDK-1163] Do not crash if relationship is not tei-te

core/src/main/java/org/hisp/dhis/android/core/relationship/internal/RelationshipHandlerImpl.java

@@ -34,6 +34,8 @@
 import org.hisp.dhis.android.core.relationship.Relationship;
 import org.hisp.dhis.android.core.relationship.RelationshipItem;
 
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
 
 import javax.inject.Inject;
@@ -65,6 +67,20 @@ final class RelationshipHandlerImpl extends IdentifiableHandlerImpl<Relationship
         this.versionManager = versionManager;
     }
 
+    @Override
+    protected Collection<Relationship> beforeCollectionHandled(Collection<Relationship> relationships) {
+        Collection<Relationship> supportedRelationships = new ArrayList<>();
+
+        for (Relationship relationship : relationships) {
+            // Only TEI - TEI relationships are supported so far
+            if (relationship.from().hasTrackedEntityInstance() && relationship.to().hasTrackedEntityInstance()) {
+                supportedRelationships.add(relationship);
+            }
+        }
+
+        return supportedRelationships;
+    }
+
     @Override
     protected Relationship beforeObjectHandled(Relationship relationship) {
         if (!versionManager.isRelationshipSupported(relationship)) {