Bug 95217 [Commands] Remove experimental handlerSubmission element from the "org.eclipse.ui.commands" extension point
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/AbstractHandler.java
return true;
	}
	/**
	 * Returns true iff there is one or more IHandlerListeners attached to this
	 * AbstractHandler.
	 * 
	 * @return true iff there is one or more IHandlerListeners attached to this
	 *         AbstractHandler
	 */
	protected final boolean hasListeners() {
		return handlerListeners != null;
	}
	/**
	 * @see IHandler#removeHandlerListener(IHandlerListener)
	 */
	public void removeHandlerListener(
			final IHandlerListener handlerListener) {
		if (handlerListener == null)
			throw new NullPointerException();
		if (handlerListeners == null) {
			return;
		}
		if (handlerListeners != null)
			handlerListeners.remove(handlerListener);
		if (handlerListeners.isEmpty()) {
			handlerListeners = null;
		}
	}
}