Bug 189622 DesignElementHandle.getMethods( ) shouldn't return null value
The return type of DesignElementHandle.getMethods( ) is List; if the design element handle doesn't have script methods, then it return null value. The return value is empty list will be better.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/extension/PeerExtensibilityProvider.java
{
				setExtensionPropertyValue( prop, value );
			}
		}
		else if ( isExtensionModelProperty( prop.getName( ) ) )
		{
			
			
			assert reportItem != null;
			reportItem.setProperty( prop.getName( ), value );
		}
		else
		{
			setExtensionPropertyValue( prop, value );
		}
	}
	/**
	 * Sets the value of the given property, which is extension property.
	 * 
	 * @param propName
	 *            the name of the property
	 * @param value
	 *            the value to set
	 */
	private void setExtensionPropertyValue( ElementPropertyDefn prop,
			Object value )
	{
		String propName = prop.getName( );
		Object oldValue = extensionPropValues.get( propName );
		if ( prop.getTypeCode( ) == IPropertyType.ELEMENT_REF_TYPE )