fixup(f6e919f), fix(builtins/method): dict.clear crash (returns nil)

Author: litlighilit

Objects/dictobject.nim

@@ -161,7 +161,9 @@ implDictMethod setdefault, [mutable: write]:
     args[1]
   self.setdefault(key, defVal)
 
-implDictMethod clear(), [mutable: write]: self.clear()
+implDictMethod clear(), [mutable: write]:
+  self.clear()
+  pyNone
 
 implDictMethod copy(), [mutable: read]:
   let newT = newPyDict()