only cache if the value is not None

Author: IAmTomahawkx

twitchio/cache.py

@@ -92,7 +92,9 @@ def _wraps(cls, id: Hashable):
                 return cache[id]
 
             value = func(cls, id)
-            cache[id] = value
+            if value is not None:
+                cache[id] = value
+
             return value
 
         return _wraps