Sync cache version check from transformers (#3179)

sync cache version check from transformers

src/diffusers/utils/hub_utils.py

@@ -199,7 +199,10 @@ if not os.path.isfile(cache_version_file):
     cache_version = 0
 else:
     with open(cache_version_file) as f:
-        cache_version = int(f.read())
+        try:
+            cache_version = int(f.read())
+        except ValueError:
+            cache_version = 0
 
 if cache_version < 1:
     old_cache_is_not_empty = os.path.isdir(old_diffusers_cache) and len(os.listdir(old_diffusers_cache)) > 0