Add null-check for IModelEditorBindingService::getEditor()

Issue-Ref: 4122
Issue-Url: af3#4122



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

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/.ratings

@@ -4,7 +4,7 @@ DataBindingUtils.java 631c47881caa13fc567679a7e4416eb777af0713 GREEN
 DragAndDropUtils.java 7aab91518aa12d76533a345bf6ed0be9ac7ff0e5 GREEN
 EObjectSelectionUtils.java 128cf8f96c6b9478171dff3deda662d5934f5f44 GREEN
 HierarchicalNameViewerComparator.java 199d82e392d4e437810cc65c0fc521dab52038e0 GREEN
-KernelUIUtils.java 46d3279ef3523b104f89a6c526109f72d36f72f2 GREEN
+KernelUIUtils.java dd58b2c618b7c847aa8cfa2d3bd9956b40b73cdd GREEN
 MessageUtilsExtended.java a08055b2f0005eebfa91662374d9ec4ce4f78aab GREEN
 ObservableUtils.java 34abfd1dfaf9c0acbb31caf1f525e7b39416c116 GREEN
 PropertiesConstantUtils.java 59b1a1e4d594bb98db3aa396f2ff6474ba405920 GREEN

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/KernelUIUtils.java

@@ -48,7 +48,7 @@ public class KernelUIUtils {
 		if(editorClazz.isInstance(editor)) {
 			return (E)editor;
 		}
-		if(editor.getSite() instanceof MultiPageEditorSite) {
+		if(editor != null && editor.getSite() instanceof MultiPageEditorSite) {
 			MultiPageEditorSite multiEditor = (MultiPageEditorSite)editor.getSite();
 			ExtendableMultiPageEditor multiPage =
 					(ExtendableMultiPageEditor)multiEditor.getMultiPageEditor();