fix change trxdbcombobbox with empti field

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1408 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/rx/rxdconst.pas

@@ -85,6 +85,8 @@ resourcestring
   SUnlockHint              = 'Enter you password';
   SDeleteMultipleRecords   = 'Delete all selected records?';
 
+  SDBComboBoxFieldNotAssigned        = '%s:TDBComboBox - DataField not assigned';
+
   SPropDefByLookup         = 'PropDefByLookup';
   SDataSourceFixed         = 'SDataSourceFixed';
   SCircularDataLink        = 'SCircularDataLink';