jp (output/template): fixed template output (media_dir was missing)

frontends/src/jp/output_template.py

@@ -48,6 +48,8 @@ class Template(object):
             command's template_data_mapping attribute will be used if it exists to convert
             data to a dict usable by the template.
         """
+        # media_dir is needed for the template
+        self.host.media_dir = self.host.bridge.getConfig('', 'media_dir')
         cmd = self.host.command
         try:
             template_path = cmd.TEMPLATE