Avoid potential NPE

Issue-Ref: 3709
Issue-Url: https://af3-developer.fortiss.org/issues/3709



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

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings

@@ -3,6 +3,6 @@ DynamicTreeItem.java afc105cf5acf3d2506d89e0892555100c234ce5b GREEN
 DynamicTreeTableUIProviderBase.java fd9fce19a65eb1006ceacb0d869bbe90a8c578b3 GREEN
 DynamicTreeTableViewer.java e474f3a890fd6525db7de8e299d7fbe67f932a15 GREEN
 DynamicTreeUIProviderBase.java 56fe4df4577b35f1e5e6e4c4be189b706c852d52 GREEN
-DynamicTreeViewer.java ffead9e76286fb7a17723cd201fdc187187a737f GREEN
+DynamicTreeViewer.java da5e24ae57777a482d8e12c8262513d8143bfa93 YELLOW
 DynamicTreeViewerBase.java 47124c847de322a0ae26eb7a114f85ce4bd02d7e GREEN
 IDoubleClickHandler.java 447f7769dead9a106b3ea3139ef0da51eb0b9a89 GREEN

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/DynamicTreeViewer.java

@@ -97,7 +97,7 @@ public final class DynamicTreeViewer<T> extends DynamicTreeViewerBase<T> {
 
 	/** Searches the {@link DynamicTreeItem} for the given value. */
 	public DynamicTreeItem<T> findItem(DynamicTreeItem<T> item, Object value) {
-		if(item == null || value == null) {
+		if(item == null || value == null || item.getValue() == null) {
 			return null;
 		}
 		if(item.getValue().equals(value)) {