don't use flask-gae-static on prod

app.py

@@ -1,6 +1,4 @@
 """Main Flask application."""
-import logging
-
 from flask import Flask
 from flask_caching import Cache
 import flask_gae_static
@@ -25,7 +23,8 @@ app.config.from_mapping(
 app.url_map.converters['regex'] = flask_util.RegexConverter
 app.after_request(flask_util.default_modern_headers)
 app.register_error_handler(Exception, flask_util.handle_exception)
-flask_gae_static.init_app(app)
+if appengine_info.DEBUG:
+    flask_gae_static.init_app(app)
 
 # don't redirect API requests with blank path elements
 app.url_map.redirect_defaults = True