Bug 189636 Custom rule template failing
Null poonter exception being thrown when trying to add a custom rule which is causing the rule cretion to fail. Also there is a minor typo in the rule template string.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
if (contentProviderInitialized) {
			return contentProvider;
		}
		synchronized (this) {
			if (contentProvider == null) {
				contentProvider = new NavigatorContentServiceContentProvider(
						this);
			}
			contentProviderInitialized = true;
		}
		return contentProvider;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.navigator.INavigatorContentService#createCommonLabelProvider()
	 */
	public ILabelProvider createCommonLabelProvider() {
		if (labelProviderInitialized) {
			return labelProvider;
		}
		synchronized (this) {
			if (labelProvider == null) {
				labelProvider = new NavigatorContentServiceLabelProvider(this);
			}
			labelProviderInitialized = true;
		}
		return labelProvider;
	}
	/*