Bug 187162 [Regression]NPE throws out when open a dataset which reference datasource has no driver[07]
Description: NPE throws out when open a dataset which reference datasource has no driver[07] Build number: 2.2.0.v20070516-0630 Steps to reproduce: 1, open a dataset makesure the datasource has no driver 2, Close all the warning dialog and the dataset dialog 3, Check the error log Expected result: No NPE throws out Actual result: NPE throws out Error log: java.lang.NullPointerException at org.eclipse.birt.report.data.oda.jdbc.ui.editors.SQLDataSetEditorPage.refreshPage(SQLDataSetEditorPage.java:1376) at org.eclipse.birt.report.data.oda.jdbc.ui.editors.SQLDataSetEditorPage.initializeControl(SQLDataSetEditorPage.java:272) at org.eclipse.birt.report.data.oda.jdbc.ui.editors.SQLDataSetEditorPage.createPageCustomControl(SQLDataSetEditorPage.java:191) at org.eclipse.datatools.connectivity.oda.design.ui.wizards.DataSetWizardPage.createControl(DataSetWizardPage.java:123) at org.eclipse.datatools.connectivity.oda.design.internal.ui.DataSetEditorPageCore.createContents(DataSetEditorPageCore.java:73) at org.eclipse.jface.preference.PreferencePage.createControl(PreferencePage.java:233) at org.eclipse.birt.report.designer.data.ui.dataset.PropertyPageWrapper.createPageControl(PropertyPageWrapper.java:45) at org.eclipse.birt.report.designer.data.ui.property.PropertyNode.createPageControl(PropertyNode.java:238) at org.eclipse.birt.report.designer.data.ui.property.AbstractPropertyDialog.showPage(AbstractPropertyDialog.java:442) at org.eclipse.birt.report.designer.data.ui.property.AbstractPropertyDialog.showSelectionPage(AbstractPropertyDialog.java:346) at org.eclipse.birt.report.designer.data.ui.dataset.DataSetEditor.showSelectionPage(DataSetEditor.java:720) at org.eclipse.birt.report.designer.data.ui.property.AbstractPropertyDialog$2.run(AbstractPropertyDialog.java:304)
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
ArrayList dbTypeList = new ArrayList( );
		DbType tableType = new DbType( DbType.TABLE_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.tabletype" ) );
		DbType viewType = new DbType( DbType.VIEW_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.viewtype" ) );
		DbType allType = new DbType( DbType.ALL_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.All" ) );
		DbType procedureType = new DbType( DbType.PROCEDURE_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.procedure" ) );
		
		dbTypeList.add( allType );
		dbTypeList.add( tableType );
		dbTypeList.add( viewType );
		if ( metaDataProvider.isProcedureSupported( ) )
			dbTypeList.add( procedureType );
		filterComboViewer.setContentProvider( new IStructuredContentProvider( ) {
			public Object[] getElements( Object inputElement )
			{
				if ( inputElement != null )
				{
					return ( (ArrayList) inputElement ).toArray( );
				}
				return new DbType[]{};
			}
			public void dispose( )
			{
			}
			public void inputChanged( Viewer viewer, Object oldInput,
					Object newInput )
			{