return default func if cache not set

Author: ohmayr

gapic/utils/cache.py

@@ -86,9 +86,7 @@ def wrapper(self, *, collisions, **kwargs):
 
         context_cache = _get_cache()
         if context_cache is None:
-            raise RuntimeError(
-                f"Cache MISSING! {func.__name__} called on {type(self).__name__} outside of context manager."
-            )
+            return func(self, collisions=collisions, **kwargs)
 
         # 2. Create the cache key
         collisions_key = frozenset(collisions) if collisions else None