Avoid NPE when opening the editor (as a WcetTableEditor) for a freshly created TaskArchitecture.

refs 2950,2562

org.fortiss.af3.allocation.ui/trunk/src/org/fortiss/af3/allocation/ui/editor/treeviewer/ParameterTableTreeViewerManager.java

@@ -106,7 +106,8 @@ public class ParameterTableTreeViewerManager<T extends ParameterTable> extends T
 	 */
 	private void createSourceEntityAnnotationColumn() {
 		String columnLabel;
-		if(!allocationTableEditor.getSourceViewModelElements().isEmpty()) {
+		if(allocationTableEditor.getEditedObject() != null &&
+				!allocationTableEditor.getSourceViewModelElements().isEmpty()) {
 			// List is non-empty: Label can be determined using first source element
 			columnLabel =
 					getAnnotationName(allocationTableEditor.getSourceViewModelElements().get(0),