Bug 139986 [CommonNavigator] Convert catch(Error/Throwable) to SafeRunner
In several places the CN framework uses catch(Error/Throwable) to ensure that code does not bring the framework down. Change these to use SafeRunner.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
return contentProvider;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.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;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.eclipse.ui.navigator.INavigatorContentService#
	 * createCommonDescriptionProvider()
	 */
	public IDescriptionProvider createCommonDescriptionProvider() {
		if (descriptionProvider != null) {
			return descriptionProvider;
		}