Add blank line to check_list (cosmetic).

(imported from commit 20a9eed98846e976c7fa2cfdb43e25e1c43c850d)

zerver/lib/validator.py

@@ -48,6 +48,7 @@ def check_list(sub_validator, length=None):
 
         if length is not None and length != len(val):
             return '%s should have exactly %d items' % (var_name, length)
+
         for i, item in enumerate(val):
             vname = '%s[%d]' % (var_name, i)
             error = sub_validator(vname, item)