Version returns 404 if version doc is missing

[hkethi002]

Fixes #882

Review Checklist

• Tests were added to cover all code changes
• Documentation was added / updated
• Code and tests follow standards in CONTRIBUTING.md

[codecov-io]

Codecov Report

Merging #943 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #943      +/-   ##
=========================================
+ Coverage   90.19%   90.2%   +<.01%     
=========================================
  Files          48      48              
  Lines        6418    6421       +3     
=========================================
+ Hits         5789    5792       +3     
  Misses        629     629

Flag	Coverage Δ
#python	90.2% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
api/handlers/confighandler.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 124ea0c...cee4e59. Read the comment docs.

[nagem]

LGTM!