Bug 161191 Null is inserted when drag columns to query text with ctrl key pressed
Description: Null is inserted when drag columns to query text with ctrl key pressed Steps to reproduce: 1. New a data source. 2. New a dataset. 3. Press and hold ctrl key, select OFFICECODE and CITY columns, drag to query text. Expected result: "CLASSICMODELS.OFFICES.OFFICECODE,CLASSICMODELS.OFFICES.CITY" is inserted in query text. Actual result: "null,CLASSICMODELS.OFFICES.OFFICECODE,CLASSICMODELS.OFFICES.CITY" is inserted
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
String namePattern = null;
		String[] tableType = null;
		cachedSearchTxt = searchTxt.getText( );
		namePattern = SQLUtility.getTailoredSearchText( searchTxt.getText( ) );
		String dbtype = getSelectedDbType( );
		cachedDbType = dbtype;
		
		if ( dbtype != null )
		{
			if ( DbType.TABLE_STRING.equalsIgnoreCase( dbtype )
					|| DbType.VIEW_STRING.equalsIgnoreCase( dbtype ) )
			{
				tableType = new String[]{
					dbtype
				};
			}
		}
		if ( metaDataProvider.isProcedureSupported( ) )
			procedureRs = metaDataProvider.getAllProcedure( catalogName,
					null,
					namePattern );
		if ( !DbType.PROCEDURE_STRING.equalsIgnoreCase( dbtype ) )
			tablesRs = metaDataProvider.getAlltables( catalogName,
					null,
					namePattern,
					tableType );
		if ( tablesRs == null && procedureRs == null )
		{
			return;