diff --git a/nifty4/utilities.py b/nifty4/utilities.py index 0dc9f7654f2dac6798fe369453d042d4c3aeadfb..e57ee28892fe8b873493876f9e6dcf43e2bd09fa 100644 --- a/nifty4/utilities.py +++ b/nifty4/utilities.py @@ -84,6 +84,8 @@ def parse_spaces(spaces, nspc): spaces = (safe_cast(int, spaces),) else: spaces = tuple(safe_cast(int, item) for item in spaces) + if len(spaces) == 0: + return spaces tmp = tuple(set(spaces)) if tmp[0] < 0 or tmp[-1] >= nspc: raise ValueError("space index out of range")