Fix home cache handler. (google#1973)

Flask methods require a return value. Also simplify the return value of
testcase list cache to be consistent.

Author: oliverchang

src/appengine/handlers/home.py

@@ -14,13 +14,12 @@
 """Home page handler_flask."""
 from __future__ import absolute_import
 
-from . import base_handler_flask
-
 from base import external_users
 from base import memoize
 from base import utils
 from datastore import data_handler
 from datastore import data_types
+from handlers import base_handler_flask
 from libs import access
 from libs import handler_flask
 from libs import helpers
@@ -152,3 +151,4 @@ def get(self):
     """GET handler_flask."""
     # pylint: disable=unexpected-keyword-arg
     _get_all_project_results(__memoize_force__=True)
+    return 'OK'

src/appengine/handlers/testcase_list.py

@@ -17,7 +17,6 @@
 from base import utils
 from datastore import data_handler
 from datastore import data_types
-from flask import make_response
 from flask import request
 from google_cloud_utils import blobs
 from handlers import base_handler_flask
@@ -224,7 +223,7 @@ def get(self):
       blobs.get_blob_size(testcase.fuzzed_keys)
       blobs.get_blob_size(testcase.minimized_keys)
 
-    return make_response(('OK', 200, {'Content-Type': 'text/plain'}))
+    return 'OK'
 
 
 class JsonHandler(base_handler_flask.Handler):