Avoid NPE when refresh()ing before the EMFDataBindingContext is set

Issue-Ref: 3470
Issue-Url: https://af3-developer.fortiss.org/issues/3470



Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/extension/base/.ratings

@@ -10,7 +10,7 @@ ModelEditorBindingBase.java 4c5ac569c0b6e7678fc8191096b26dfd09fdcb98 GREEN
 ModelElementHandlerBase.java 384727748f125c9d43f19d9c0eba4ba1be5a7a26 GREEN
 MultiEObjectActionBase.java 9e237d8ea640c4194e4877af4a9cfce88698e543 GREEN
 NamedCommentedModelElementHandlerBase.java 681b98b50b362f01abb7a36f108f4f11b9e51829 GREEN
-PropertySectionBase.java 3601ee8bd77be45ff770a5ee1c7536f100bee6b2 GREEN
+PropertySectionBase.java 8a0c90a7657fb93695d50f570ff8043cf7bb8602 YELLOW
 TutorialStepUIAtomicBase.java cea2a158158b476de2108d2309afcf47f217b6d9 GREEN
 TutorialStepUIAtomicWithWhitelistBase.java a9788ae514f62d27169c737ef59fb583234b5d43 GREEN
 TutorialStepUICompositeBase.java 8225210eacb5b88de47d78280c5819f572f00ffa GREEN

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/extension/base/PropertySectionBase.java

@@ -282,8 +282,10 @@ public abstract class PropertySectionBase extends AbstractPropertySection {
 	 */
 	@Override
 	public void refresh() {
-		dbc.dispose();
-		dbc = new EMFDataBindingContext();
+		if(dbc != null) {
+			dbc.dispose();
+			dbc = new EMFDataBindingContext();
+		}
 	}
 
 	/**