IDEMPIERE-663 Zk: Remove the need of re-query for table editor after user have create a new record. Fixed NPE.

org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/editor/WTableDirEditor.java

@@ -211,10 +211,12 @@ ContextMenuListener, IZoomableEditor
     }
 
 	private void createCacheListener() {
+		if (lookup != null) {
 			String columnName = lookup.getColumnName();
 			String tableName = columnName.substring(0, columnName.indexOf("."));
 			tableCacheListener = new CCacheListener(tableName, this);
 		}
+	}
 
     @Override
     public String getDisplay()