fixes

nifty4/operators/scaling_operator.py

@@ -21,6 +21,7 @@ import numpy as np
 from ..field import Field
 from ..multi.multi_field import MultiField
 from .endomorphic_operator import EndomorphicOperator
+from ..domain_tuple import DomainTuple
 
 
 class ScalingOperator(EndomorphicOperator):

nifty4/sugar.py

@@ -197,7 +197,7 @@ def from_local_data(domain, arr):
 
 
 def makeDomain(domain):
-    if isinstance(domain, dict):
+    if isinstance(domain, (MultiDomain, dict)):
         return MultiDomain.make(domain)
     return DomainTuple.make(domain)