Log frontend exceptions to the standard output

managetests/frontend/__init__.py

@@ -16,6 +16,7 @@
 
 import queue
 import threading
+import logging
 
 import flask
 
@@ -70,4 +71,10 @@ def create_app(manager, processor):
         processor.append(flask.request.json)
         return "OK", 200
 
+    # Because it's impossible to run this app in debug mode, this handler
+    # prints exceptions to the standard output
+    handler = logging.StreamHandler()
+    handler.setLevel(logging.INFO)
+    app.logger.addHandler(handler)
+
     return app