Bug 175664 [Mac] Unexpected internal exception occurs when invoke expression builder
Description: There are two problems: 1. "fx" button (Click this button to invoke Expression Builder) could not be displayed correctly, nothing displayed in the button. 2. Click on the button, an unexpected internal exception occurs. Version:2.2.0.v20070205 Steps to reproduce: 1.Insert a Data item to the layout. Click "fx" button to invoke the expression builder, although on Mac "fx" button could not display correctly. Error log: Argument cannot be null Plug-in Provider: Eclipse.org Plug-in Name: BIRT Designer UI Plug-in ID: org.eclipse.birt.report.designer.ui Error Code: Error.GUIException.invokedByUnexpectedException Error Message:Argument cannot be null
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
}
			catch ( SemanticException e )
			{
				GUIException exception = GUIException.createGUIException( ReportPlugin.REPORT_UI,
						e,
						"Library.DND.messages.cannotApplyTheme" );
				ExceptionHandler.handle( exception );				
			}
		}
		return applyThemeHandle;
	}
	/**
	 * Get
	 * 
	 * @param lineText
	 * @return
	 */
	public static int[] getExpressionBidiSegments( String lineText )
	{
		if ( lineText == null || "".equals( lineText ) ) { 
			return null;
		}
		int[] level = getExpressionBidiLevel( lineText );
		int[] segments = new int[level.length];
		int j = 0;
		segments[j++] = 0;
		for ( int i = 1; i < level.length; i++ )
		{
			if ( level[i] != level[i - 1] )
				segments[j++] = i;