Fix error in GitlabStatus plugin

May 15 09:20:10 chef hydra-queue-runner[27523]: Hydra::Plugin::GitlabStatus=HASH(0x519a7b8)->buildFinished: Can't call method "value" on an undefined value at /nix/store/858hinflxcl2jd12wv1r3a8j11ybsf6w-hydra-0.1.2629.89fa829/libexec/hydra/lib/Hydra/Plugin/GitlabStatus.pm line 57.

(cherry picked from commit 438ddf52898cddf100cf59ca91f32581368c9b2e)

Created by  Eelco Dolstra  on May 15, 2019
Z6A2MR4FRQ7IJL4ZUA3YMPMQCY7LCCEBW4AJNBW7WYVDQ7K6A3OQC
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