Update niworkflows/utils/spaces.py

Author: effigies

niworkflows/utils/spaces.py

@@ -712,7 +712,7 @@ def __call__(self, parser, namespace, values, option_string=None):
         invalid_spaces = []
         for val in values:
             val = val.rstrip(':')
-            space = val.split(':')[0]
+            space = val.split(':', 1)[0]
             if space in NONSTANDARD_REFERENCES and ':' in val:
                 invalid_spaces.append(val)