Fix regressions in v3.4.0 RC2

[gdubicki]

Fixes (some) of #658.

For now fix showing certname as URL in Query view.

[codecov]

Codecov Report

Merging #661 (16163c5) into master (f50f278) will decrease coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #661      +/-   ##
==========================================
- Coverage   82.72%   82.45%   -0.28%     
==========================================
  Files          12       11       -1     
  Lines         903      889      -14     
==========================================
- Hits          747      733      -14     
  Misses        156      156              

Impacted Files	Coverage Δ
puppetboard/core.py	100.00% <100.00%> (ø)
puppetboard/utils.py	93.02% <100.00%> (-0.86%)	⬇️

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