DSE.UI Synth: Disable UI updates for missing DSE project

Issue-Ref: 4064
Issue-Url: https://af3-developer.fortiss.org/issues/4064

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

org.fortiss.af3.exploration.ui/src/org/fortiss/af3/exploration/ui/perspective/synthesis/.ratings

@@ -3,5 +3,5 @@ SolverSettingsDialog.java 25b3541fc6eab090500321fa32a3f68992fff0a0 GREEN
 SolverSettingsTreeTableViewer.java 279e92b20a6b48e8e99ea7a2039fef419ea42826 GREEN
 SynthesisCategoryExplorationTargetContentProvider.java 410f00e07b5f4208b762b80baf563b2b73a93a71 GREEN
 SynthesisCategoryRuleSetContentProvider.java 039913dba18b0248d10a77275258bc9acf9526cf GREEN
-SynthesisFXContentController.java 50e97d06c11c2bb24cd8da4d975191e269b6188f GREEN
+SynthesisFXContentController.java 8ea19df45819a0622e77a4a1e82d9e34964306c4 YELLOW
 SynthesisFXViewPart.java e40c2bd501d87b41c6324ab80fd34e64410db644 GREEN

org.fortiss.af3.exploration.ui/src/org/fortiss/af3/exploration/ui/perspective/synthesis/SynthesisFXContentController.java

@@ -22,6 +22,7 @@ import static javafx.collections.FXCollections.observableArrayList;
 import static org.eclipse.core.runtime.Assert.isTrue;
 import static org.fortiss.af3.exploration.service.IDSEBackend.EXPLORATION_TYPE.FEASIBILITY_CHECK;
 import static org.fortiss.af3.exploration.service.IDSEBackend.EXPLORATION_TYPE.OPTIMIZATION;
+import static org.fortiss.af3.exploration.ui.perspective.service.IEventListener.DSE_EVENT.DSE_SELECTED_EVENT;
 import static org.fortiss.af3.exploration.ui.perspective.service.IEventListener.DSE_EVENT.PROCESS_STEP_ADDED;
 import static org.fortiss.af3.exploration.ui.perspective.service.IEventListener.DSE_EVENT.RULE_SET_ADDED;
 import static org.fortiss.af3.exploration.ui.perspective.service.IEventListener.DSE_EVENT.RULE_SET_CHANGED;
@@ -570,6 +571,10 @@ public class SynthesisFXContentController extends CompositeFXControllerBase<Anch
 	/** {@inheritDoc} */
 	@Override
 	public void propertyChanged(Object source, DSE_EVENT event) {
+		if(activeDse == null || event != DSE_SELECTED_EVENT) {
+			return;
+		}
+
 		switch(event) {
 			case EXP_TARGET_ADDED:
 				updateTgtRuleSetLists();