Bug 165278 this.getDisplayContent()="" in script of text will destroy preview[0801]
Description: this.getDisplayContent()="" in script of text will destroy preview Build number:2.1.2.v20061120 and 2.2.0.v20061117 Steps to reproduce: 1. Insert a text item, select it and switch to script editor 2. Input this.getDisplayContent()="" and preview Expected result: Error message about the incorrect script. Actual result: In 2.1.2, I saw HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. In 2.2.0, I saw error dialog with java.lang.ClassCastException.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
/**
	 * Notify page break listeners that page is broken.
	 */
	public void firePageBreakEvent( )
	{
		if ( pageBreakListeners != null )
		{
			for ( int i = 0; i < pageBreakListeners.size( ); i++ )
			{
				( (IPageBreakListener) pageBreakListeners.get( i ) )
						.onPageBreak( );
			}
		}
	}
	
	/**
	 * Remove a page break listener.
	 * 
	 * @param listener
	 *            the page break listener.
	 */
	public void removePageBreakListener( IPageBreakListener listener )
	{
		if ( pageBreakListeners != null )
		{
			pageBreakListeners.remove( listener );
		}
	}
}