Bug 124620 Referenced Parameter icon should be invalid if the parameter in library is deleted
Description: Referenced parameter icon should be invalid if the source parameter in library is deleted. Steps to reproduce: 1.Create a library. Insert a report scalar parameter. 2.Create a report, use the above library. In the library explorer, pull the parameter to the data explorer view of report. 3.Open the library file, delete the parameter. Then reopen the report design file, the icon of parameter seems nothing happened. But if those operations happened in dataset, the icon of dataset in the report will be invalid. It is acceptable. Expected Result: The icon of referenced parameter should be invalid.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
targetHandle.setProperty( propName, value );
		}
	}
	/**
	 * Checks this element with semantic rules.
	 * 
	 * @return the list of errors, each of which is the <code>ErrorDetail</code>
	 *         object.
	 * @see ErrorDetail
	 */
	public List semanticCheck( )
	{
		
		List exceptionList = getElement( ).validate( module );
		List errorDetailList = ErrorDetail.convertExceptionList( exceptionList );
		return errorDetailList;
	}
	/**
	 * Determines if this element can be dropped from its container.
	 * 
	 * @return <code>true</code> if it can be dropped. Returns
	 *         <code>false</code> otherwise.
	 */
	public boolean canDrop( )
	{
		boolean flag = getElement( ).canDrop( );
		if ( !flag )
			return false;
		return !getModule( ).isReadOnly( );
	}