Fixed null value of steps and logs in reporter HttpStatusPush api

[timqi]

fix #3180

[codecov]

Codecov Report

Merging #3710 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3710      +/-   ##
==========================================
+ Coverage   88.45%   88.45%   +<.01%     
==========================================
  Files         323      323              
  Lines       34001    34002       +1     
==========================================
+ Hits        30076    30077       +1     
  Misses       3925     3925

Impacted Files	Coverage Δ
master/buildbot/reporters/utils.py	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 64e1bdd...4879c38. Read the comment docs.

[tardyp]

Can you please add a little bit more insight in the commit log?
test raising the problem would be great, and newsfragment is necessary

[timqi]

This commit fixes the issue that null value of steps and logs of HttpStatusPush reporter api, reported at #3180 . may no new features added. Hope can be merged and repack in pip

[tardyp]

@timqi please use git commit --amend in order to add this info into the git commit log.

newsfragments are also for bug fixes. please add one as described here: https://github.com/buildbot/buildbot/blob/master/master/buildbot/newsfragments/README.txt

I am afraid I will not do a release just for this fix, but this fix will be included in the next release which is due for beginning of november.

thanks for you contibution and effort to follow our process!