Fix potential issue with messaging in MuonTrackSteering

Thomas Streblerrequested to merge
tstreble/athena:24_MuonTrackSteering into 24.0

Follow up to !79944 (merged)

Fix potential issue with verbose messaging in MuonTrackSteering, in case segInfo is a nullptr, highlighted by build warning in the sweep to main. Labelled as sweep:ignore since it was already addressed in the sweep MR.

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