Bug 96924 [content assist] don't show templates in restricted situations
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/template/contentassist/TemplateProposal.java
if (fDisplayString == null) {
			String[] arguments= new String[] { fTemplate.getName(), fTemplate.getDescription() };
			fDisplayString= Messages.format(TemplateContentAssistMessages.TemplateProposal_displayString, arguments);
		}
		return fDisplayString;
	}
	public void setDisplayString(String displayString) {
		fDisplayString= displayString;
	}
	/*
	 * @see ICompletionProposal#getImage()
	 */
	public Image getImage() {
		return fImage;
	}
	/*
	 * @see ICompletionProposal#getContextInformation()
	 */
	public IContextInformation getContextInformation() {
		return null;
	}
	private void openErrorDialog(Shell shell, Exception e) {
		MessageDialog.openError(shell, TemplateContentAssistMessages.TemplateEvaluator_error_title, e.getMessage());
	}
	private void handleException(Shell shell, CoreException e) {
		ExceptionHandler.handle(e, shell, TemplateContentAssistMessages.TemplateEvaluator_error_title, null);
	}
	/*
	 * @see IJavaCompletionProposal#getRelevance()
	 */