Modeler: Do not react on clicks on the service nodes in DbImport UI

Author: stariy95

modeler/cayenne-modeler/src/main/java/org/apache/cayenne/modeler/ui/project/editor/datamap/dbimport/ReverseEngineeringTreePanel.java

@@ -127,6 +127,10 @@ public void mouseClicked(MouseEvent e) {
                 } else if (reverseEngineeringTree.getSelectionPath() != null) {
                     DbImportTreeNode selectedNode = reverseEngineeringTree.getSelectedNode();
 
+                    if (selectedNode.isLabel() || selectedNode.isReverseEngineering()) {
+                        return;
+                    }
+
                     if (selectedNode.isExcludeColumn() || selectedNode.isIncludeColumn()) {
                         DbImportTreeNode expandNode = selectedNode.getParent();