Harden commonmark2html function

validata_ui/__init__.py

@@ -76,7 +76,13 @@ blueprint = flask.Blueprint('filters', __name__)
 @jinja2.contextfilter
 @blueprint.app_template_filter()
 def commonmark2html(context, value):
-    return commonmark(value)
+    if not value:
+        return value
+    try:
+        return commonmark(value)
+    except Exception as ex:
+        log.exception(ex)
+        return value
 
 
 app.register_blueprint(blueprint)