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
* 
	 * @param map
	 *            name value pair.
	 */
	public void registerBeans( Map map )
	{
		if ( map != null )
		{
			Iterator iter = map.entrySet( ).iterator( );
			while ( iter.hasNext( ) )
			{
				Map.Entry entry = (Map.Entry) iter.next( );
				Object keyObj = entry.getKey( );
				Object value = entry.getValue( );
				if ( keyObj != null )
				{
					String key = keyObj.toString( );
					registerBean( key, value );
				}
			}
		}
	}
	/**
	 * declares a variable in the current scope. The variable is then accessible
	 * through JavaScript.
	 * 
	 * @param name
	 *            variable name
	 * @param value
	 *            variable value