Exception handling on loading cache

__init__.py

@@ -227,8 +227,12 @@ class property_cache_pickle(object):
 
     def _load_cache(self):
         if os.path.exists(self._cache_filename):
-            self._load_only()
-            return True
+            try:
+                self._load_only()
+            except:
+                logger.exception("Exception while loading cache file %s", self._cache_filename)
+            else:
+                return True
         else:
             logger.debug('Cache file does not exists (yet).')
         return False