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/extensions/LinkHelperManager.java
private static final LinkHelperManager instance = new LinkHelperManager();
	private static final LinkHelperDescriptor[] NO_DESCRIPTORS = new LinkHelperDescriptor[0];
	private List descriptors;
	/**
	 * @return the singleton instance.
	 */
	public static LinkHelperManager getInstance() {
		return instance;
	}
	private LinkHelperManager() {
		new LinkHelperRegistry().readRegistry();
	}
	/**
	 * Return the link helper descriptors for a given selection and content
	 * service.
	 * 
	 * @param anObject
	 *            An object from the viewer.
	 * @param aContentService
	 *            The content service to use for visibility filtering. Link