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
numberFormatters.put( value, fmt );
		}
		return fmt;
	}
	/**
	 * get a date formatter object
	 * 
	 * @param value
	 *            date format
	 * @return formatter object
	 */
	public DateFormatter getDateFormatter( String value )
	{
		DateFormatter fmt = (DateFormatter) dateFormatters.get( value );
		if ( fmt == null )
		{
			fmt = new DateFormatter( value, ULocale.forLocale(locale) );
			dateFormatters.put( value, fmt );
		}
		return fmt;
	}
	/**
	 * set the executor used in the execution context
	 * 
	 * @param executor
	 */
	public void setExecutor( IReportExecutor executor )
	{
		this.executor = executor;
	}