docs: def render_content(self):
          """Render the panel's content."""
          if not self.has_content:
              return ""
          template = self.template
          if isinstance(self.template, str):
              template = self.app.ps.jinja2.env.get_template(self.template)
          context = self.render_vars()
          content = template.render(app=self.app, request=self.request, **context)
          return content