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/actions/CommonActionProviderDescriptor.java
INavigatorContentExtPtConstants {
	private static final String DEFAULT_ID = "org.eclipse.ui.navigator.actionProvider"; 
	
	private static int count = 0;
	private final IConfigurationElement configurationElement;
	private final String pluginId;
	
	private final boolean isNested;
	private Set dependentDescriptors;
	private Set overridingDescriptors;
	private IConfigurationElement enablementElement;
	private Expression enablement;
	private boolean hasLoadingFailed;
	private String definedId;
	private String visibilityId;
	private String dependsOnId;
	private String overridesId;
	
	private String appearsBeforeId;
	private String toString;
	private Priority priority;
	/**
	 * @param aConfigElement
	 *            A configuration element with the name "actionProvider" and a
	 *            "class" attribute which subclasses
	 *            {@link CommonActionProvider}.
	 */