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
out.write( buffer, 0, size );
				size = in.read( buffer );
			}
			byte[] script = out.toByteArray( );
			execute( new String( script, "UTF-8" ), fileName, 1 ); 
			in.close( );
		}
		catch ( IOException ex )
		{
			log.log( Level.SEVERE,
					"loading external script file " + fileName + " failed.", 
					ex );
			addException( new EngineException(
					MessageConstants.SCRIPT_FILE_LOAD_ERROR, url.toString( ),
					ex ) ); 
			
		}
	}
	/**
	 * get current scope
	 * 
	 * @return scope object
	 */
	public Scriptable getScope( )
	{
		return scriptContext.getScope( );
	}
	public Scriptable getSharedScope( )
	{
		return scriptContext.getSharedScope( );