Bug 92344 [call hierarchy] JavaModelException when accessing removed type
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/util/JavadocHelpContext.java
if (fText == null)
			fText= "";  
		
	}
	private boolean doesNotExist(URL url) {
		if (url.getProtocol().equals("file")) { 
			File file= new File(url.getFile());
			return !file.exists();
		}
		return false;
	}
	public IHelpResource[] getRelatedTopics() {
		return fHelpResources;
	}
	public String getText() {
		return fText;
	}
	public String getStyledText() {
		return fText;
	}
	public String getCategory(IHelpResource topic) {
		if (topic instanceof JavaUIHelpResource)
			return JavaUIMessages.JavaUIHelpContext_javaHelpCategory_label; 
		return null;
	}
}