Merge branch 'fix194' into 'master'

Fixed behaviour when when only one detector is being used and coherence-test=True

Closes #194

See merge request lscsoft/bilby_pipe!370
10 jobs for master in 5 minutes and 55 seconds (queued for 7 seconds)
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Downloading artifacts for python-3.7 (1076730)...
Downloading artifacts from coordinator... ok
id=1076730 responseStatus=200 OK token=3vPwWbAx
Executing "step_script" stage of the job script
$ mkdir public/
$ mv htmlcov/ public/
$ mv /builds/lscsoft/bilby_pipe/coverage_badge.svg public/
mv: can't rename '/builds/lscsoft/bilby_pipe/coverage_badge.svg': No such file or directory
Cleaning up file based variables
ERROR: Job failed: exit code 1