Fixed DataSync sometimes not catching Websocket responses

When `createRecord` is called, and a `DIdInsert` or similiar message without a `requestId` was received, the call to `.splice` accidentally cleared the `pendingRequests` array. After that responses to pending messages are ignored and certain functionality hangs forever

lib/IHP/DataSync/ihp-datasync.js

@@ -120,7 +120,9 @@ class DataSyncController {
 
         // Remove request from array, as we don't need it anymore. If we don't remove it we will
         // build up a lot of memory and slow down the app over time
-        this.pendingRequests.splice(this.pendingRequests.indexOf(request), 1);
+        if (request !== undefined) {
+            this.pendingRequests.splice(this.pendingRequests.indexOf(request), 1);
+        }
 
         this.receivedFirstResponse = true;