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
overrideableExtensions.add(getExtension(descriptor));
			}
		}
		return overrideableExtensions;
	}
	/*
	 * (Non-Javadoc)
	 * 
	 * @see INavigatorContentService#getContentDescriptorById(String)
	 */
	public INavigatorContentDescriptor getContentDescriptorById(
			String anExtensionId) {
		return CONTENT_DESCRIPTOR_REGISTRY.getContentDescriptor(anExtensionId);
	}
	/**
	 * 
	 * @param anExtensionId
	 *            The id used to define the
	 *            <b>org.eclipse.ui.navigator.navigatorContent
	 *            /navigatorContent</b> extension.
	 * @return An instance of the content extension for the given extension id.
	 *         May return <b>null</b> if the id is invalid.
	 */
	public INavigatorContentExtension getContentExtensionById(
			String anExtensionId) {
		NavigatorContentDescriptor descriptor = CONTENT_DESCRIPTOR_REGISTRY
				.getContentDescriptor(anExtensionId);
		if (descriptor != null)
			return getExtension(descriptor);
		return null;