fix according to comments

theano/gof/compiledir.py

@@ -351,6 +351,7 @@ def print_compiledir_content():
     for dir in os.listdir(compiledir):
         filename = os.path.join(compiledir, dir, "key.pkl")
         with open(filename, 'rb') as file:
+            try:
                 keydata = pickle.load(file)
                 ops = list(set([x for x in flatten(keydata.keys)
                                 if isinstance(x, theano.gof.Op)]))
@@ -370,6 +371,8 @@ def print_compiledir_content():
 
                 nb_keys.setdefault(len(keydata.keys), 0)
                 nb_keys[len(keydata.keys)] += 1
+            except IOError:
+                pass
 
     print("List of %d compiled individual ops in this theano cache %s:" % (
         len(table), compiledir))