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Prevent dereferencing of nullptr

Marco Clemencic requested to merge fix-nullptr-deref into master

A segfault of a Moore test in optimized builds in lhcb-gaudi-head is caused by a nullptr that is dereferenced.

This prevent it to happen (although I'm not sure what to expect there).

The potential nullptr dereferencing has been there for a while, but it got exposed only recently by some changes in Gaudi and LHCb!4289 (merged) removes an undefined behavior always exposing the problem.

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