Bug 277873 [CSS] Exception handling for illegal color name
examples/org.eclipse.e4.ui.examples.css/src/org/eclipse/e4/ui/examples/css/editor/AbstractCSSEditor.java
* @return
	 */
	protected CSSEngine getCSSEngine() {
		if (engine == null) {
			
			engine = createCSSEngine();
			
			engine.setErrorHandler(new CSSErrorHandler() {
				public void error(Exception e) {
					handleExceptions(e);
				}
			});
		} else {
			
			engine.reset();
		}
		if (isHTMLSelector()) {
			
			
			engine.setElementProvider(getHTMLElementProvider());
		} else {
			
			
			
			engine.setElementProvider(getNativeWidgetElementProvider());
		}
		return engine;
	}
	/**
	 * Apply Styles comming from <code>getStyleSheetContent()</code> method to