Handle unexpected errors from pylibmc

app/scodoc/sco_cache.py

@@ -55,7 +55,9 @@
 #
 
 import time
+import traceback
 
+import pylibmc
 from flask import g
 
 from app.scodoc import notesdb as ndb
@@ -80,7 +82,12 @@ class ScoDocCache:
     @classmethod
     def get(cls, oid):
         """Returns cached evaluation, or None"""
-        return CACHE.get(cls._get_key(oid))
+        try:
+            return CACHE.get(cls._get_key(oid))
+        except pylibmc.Error:
+            log("Warning: memcached error")
+            log(traceback.format_exc())
+            return None
 
     @classmethod
     def set(cls, oid, value):