Bug 123042 When do some operation on the data drive manager, the eclipse may be broken.
Description: When do some operation on the data drive manager, the eclipse may be broken. Steps to reproduce: 1. new a JDBC data resource, and click the "Manage drivers" 2. delete a Jar file , and click "OK" 3. click the "Manage drivers" , add the deleted Jar File and click "OK" 4. click the "Manage drivers" and click the 'Drivers' tab, and set a 'Display name' and 'URL Template' and clcik 'OK' 5. click the "Manage drivers" and click the 'Drivers' tab, and delete the 'Display name' and 'URL Template' and clcik 'OK' Actual result: The eclipse is broken. Expect result: The eclipse runs in good shape.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/dialogs/JdbcDriverManagerDialog.java
private String displayName = ""; 
		private String template = ""; 
		/**
		 * The constructor.
		 * 
		 * @param parentShell
		 */
		public EditJdbcDriverDialog( Shell parentShell )
		{
			super( parentShell );
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jface.window.Window#create()
		 */
		public void create( )
		{
			super.create( );
			Point pt = getShell( ).computeSize( -1, -1 );
			pt.x = Math.max( pt.x, 400 );
			getShell( ).setSize( pt );
			getShell( ).setText( JdbcPlugin.getResourceString( "driverManagerDialog.text.EditDriverTitle" ) ); 
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
		 */
		protected Control createDialogArea( Composite parent )