code: String getTemplateString() {
  		String templateString = null;
  
  		Template template = getSelectedTemplate();
  		if (template != null) {
  			TemplateContextType contextType = GlassmakerUIPlugin.getDefault().getTemplateContextRegistry().getContextType(CardContextType.CONTEXT_TYPE);
  			IDocument document = new Document();
  			TemplateContext context = new DocumentTemplateContext(contextType, document, 0, 0);
  			try {
  				TemplateBuffer buffer = context.evaluate(template);
  				templateString = buffer.getString();
  			}
  			catch (Exception e) {
  				GlassmakerUIPlugin.logError("Could not create template for new html", e); 
  			}
  		}
  
  		return templateString;
  	}
docs: Returns template string to insert.
  
  @return String to insert or null if none is to be inserted