Bug 152430 Key can modify to empty string
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/CustomColorHandle.java
* 
	 * 
	 * @return the color value as an integer RGB value. Return <code>-1</code>
	 *         if the color value is not valid or the color value is
	 *         <code>null</code>.
	 */
	public int getRGB( )
	{
		return ( (CustomColor) getStructure( ) ).getRGB( );
	}
	/**
	 * Returns the qualified name of this element. The qualified name is the
	 * name of this element if this element is in module user is editing.
	 * 
	 * @return the qualified name of thie element.
	 */
	public String getQualifiedName( )
	{
		if ( getName( ) == null )
			return null;
		Module module = getModule( );
		if ( module instanceof Library )
		{
			String namespace = ( (Library) module ).getNamespace( );
			return StringUtil.buildQualifiedReference( namespace, getName( ) );
		}
		return getName( );
	}
}