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 tableName = tablesRs.getString( "TABLE_NAME" );
							String type = tablesRs.getString( "TABLE_TYPE" );
							if ( type.equalsIgnoreCase( "SYSTEM TABLE" ) )
								continue;
							int dbType = DbObject.TABLE_TYPE;
							if ( type.equalsIgnoreCase( "TABLE" ) )
							{
								image = tableImage;
								dbType = DbObject.TABLE_TYPE;
							}
							else if ( type.equalsIgnoreCase( "VIEW" ) )
							{
								image = viewImage;
								dbType = DbObject.VIEW_TYPE;
							}
							DbObject dbObject = new DbObject( getTableNameWithSchema( schemaName,
									tableName ),
									tableName,
									dbType,
									image );
							tableList.add( dbObject );
							count ++;
						}
					}
					if ( needToCreateProcedureNode( dbtype, procedureRs ))
					{
						String fullyQualifiedTableName = "STORED PROCEDURES";