Fix unwanted FATAL when TOF not used

Cf redmine issue #2091.

This should fix the issue.
The bug exists in the release candidate. While it should not impact Physics Studies where removing TOF does not make sense, it may block some detectors/materials studies where it is necessary to remove material at this place, so it should probably be part of a patched release.

changed milestone to %APR21

added BugFix label

Sorry I made another copy paste error with a == instead of a !=

I will fix this tomorrow morning

added 1 commit

• 9c673630 - Fix unwanted FATAL when TOF not used

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Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

approved this merge request

merged