Remove check

Author: TomAugspurger

pandas/core/arrays/numpy_.py

@@ -215,9 +215,6 @@ def __setitem__(self, key, value):
 
         if not lib.is_scalar(key) and is_list_like(key):
             key = np.asarray(key)
-            if not len(key):
-                # early return to avoid casting unnecessarily.
-                return
 
         if not lib.is_scalar(value):
             value = np.asarray(value)