Merge branch 'add_useful_error' into 'NIFTy_4'

Add error message to MultiDomains See merge request ift/NIFTy!267

Merge branch 'add_useful_error' into 'NIFTy_4'
Add error message to MultiDomains See merge request ift/NIFTy!267
5f133b64 · Philipp Arras · 918c2443 · 72ede95a · 5f133b64
Commit 5f133b64 authored Jun 18, 2018 by Philipp Arras
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nifty4/multi/multi_domain.py nifty4/multi/multi_domain.py +1 -1

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--- a/nifty4/multi/multi_domain.py
+++ b/nifty4/multi/multi_domain.py
@@ -49,7 +49,7 @@ class MultiDomain(frozendict):

    def __init__(self, domain, _callingfrommake=False):
        if not _callingfrommake:
-            raise NotImplementedError
+            raise NotImplementedError('To create a MultiDomain call `MultiDomain.make()`.')
        super(MultiDomain, self).__init__(domain)

    @staticmethod