Tooling Kernel: Fixed editing issue in DynamicTreeTable

Combo cells from DynamicTreeTableUIProviderBase are only editable for non-null elements.

Issue-Ref: 4133 Issue-Url: #4133

Signed-off-by: Andreas Bayha bayha@fortiss.org

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

@@ -5,7 +5,7 @@ DynamicTextFieldTreeTableCell.java de24117e6f785b328f1ff62383626a0b4b54e8ff GREE
 DynamicTreeContentProviderBase.java 91896b1fb5104d126544c44c1ff8c30f2a13a8d6 GREEN
 DynamicTreeItem.java 7486071d20e896d6ca9a9101bf105caccf3656d0 GREEN
 DynamicTreeItemBase.java d883066ecc181120302ca32f328538de7a45b093 GREEN
-DynamicTreeTableUIProviderBase.java 668fb957d5c0c0f67d6bfd0b8d1130bc58997e3f GREEN
+DynamicTreeTableUIProviderBase.java a091824351771293b8f68a53e658d712a2128878 GREEN
 DynamicTreeTableViewer.java ead6f6671e9cb6b14632940bf440cba7e81fcd98 GREEN
 DynamicTreeUIProviderBase.java 82d3c051213f0147f4c67ad247a08696cee73110 GREEN
 DynamicTreeViewer.java 545f1ca10b7b3cad171b294a4b447875da45c9ed GREEN