more debugging and catch md misconfigured error

incorporealcms/pages.py

@@ -49,15 +49,22 @@ def display_page(path):
 def handle_markdown_file_path(resolved_path):
     """Given a location on disk, attempt to open it and render the markdown within."""
     try:
+        logger.debug("opening resolved path '%s'", resolved_path)
         with app.open_instance_resource(resolved_path, 'r') as entry_file:
             mtime = datetime.datetime.fromtimestamp(os.path.getmtime(entry_file.name), get_localzone())
             entry = entry_file.read()
+        logger.debug("resolved path '%s' read", resolved_path)
     except OSError:
         logger.exception("resolved path '%s' could not be opened!", resolved_path)
         abort(500)
     else:
-        md = init_md()
-        content = Markup(md.convert(entry))
+        try:
+            md = init_md()
+            content = Markup(md.convert(entry))
+        except TypeError:
+            logger.exception("error loading/rendering markdown!")
+            abort(500)
+
         logger.debug("file metadata: %s", md.Meta)
 
         parent_navs = generate_parent_navs(resolved_path)