Don't post comment for curl failure
Don't post comment for curl failure

Only post the pull request comment on a 200 return from the curl
command. Sometimes the message posts with an empty github ID
intermittently. The script needs to know the name of the simulation in
order to extract the github ID. If curl fails then it cannot do
so. This is partly a debugging step so we can see the return status
when failures occur.

wd15/chimad-phase-field,wd15/chimad-phase-field,wd15/chimad-phase-field