protect against errors from the hound API

When codesearch.o.o is re-indexing the API responds with something
that is not JSON. Rather than worry about all of the various errors we
could receive from an API that is only providing advisory information,
catch anything, log it, and proceed in a safe manner.

Change-Id: Ia910215029b3ece31db180396dbb50c82a7f3a59
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

openstack_releases/hound.py

@@ -16,9 +16,12 @@
 
 """
 
+import logging
+
 import requests
 
 
+LOG = logging.getLogger(__name__)
 _URL = 'http://codesearch.openstack.org/api/v1/search'
 
 
@@ -39,6 +42,7 @@ def _query(q, **kwds):
 
 
 def get_dependency_listings(package_name):
+    try:
         return _query(
             q=package_name,
             # NOTE(dhellmann): Including setup.cfg shows *lots* of results
@@ -47,6 +51,10 @@ def get_dependency_listings(package_name):
             # those.
             files='(.*requirements.txt|.*constraint.*.txt)',
         )
+    except Exception as e:
+        LOG.error('Could not fetch users of %s: %s',
+                  package_name, e)
+        return {}
 
 
 def show_dependency_listings(package_name, official_repos):