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
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( null,
							tableName ),
							tableName,
							dbType,
							image );
					tableList.add( dbObject );
					count++;
				}
			}
			if ( needToCreateProcedureNode( dbtype, procedureRs ) )
			{
				String fullyQualifiedTableName = "STORED PROCEDURES";
				DbObject dbObject = new DbObject( fullyQualifiedTableName,
						"STORED PROCEDURES",
						DbObject.PROCEDURE_TYPE,
						tableImage );
				tableList.add( dbObject );
			}
			TreeItem item[] = Utility.createTreeItems( rootNode,
					tableList,