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
return reportContext;
		}
	}
	/**
	 * @return Returns the runnable.
	 */
	public ReportRunnable getRunnable( )
	{
		return runnable;
	}
	/**
	 * @param runnable
	 *            The runnable to set.
	 */
	public void setRunnable( IReportRunnable runnable )
	{
		this.runnable = (ReportRunnable)runnable;
		ReportDesignHandle reportDesign = (ReportDesignHandle) runnable
				.getDesignHandle( );
		scriptContext.registerBean( "design", new ReportDesign( reportDesign ) );
	}
	/**
	 * @return Returns the renderOption.
	 */
	public IRenderOption getRenderOption( )
	{
		return renderOption;
	}
	/**
	 * @param renderOption