fix: Fix undefined error with blank validators

[sambhav]

Fixes #402
Fixes #403

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@2338bde). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #404   +/-   ##
=========================================
  Coverage          ?   93.80%           
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  Files             ?       73           
  Lines             ?     1662           
  Branches          ?      325           
=========================================
  Hits              ?     1559           
  Misses            ?       90           
  Partials          ?       13           

Impacted Files	Coverage Δ
lib/actions/close.js	100.00% <100.00%> (ø)
lib/actions/comment.js	100.00% <100.00%> (ø)
lib/actions/labels.js	100.00% <100.00%> (ø)

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[sambhav]

@jusx @shine2lay quick review please - mostly just docs :)

[jusx]

LGTM. I like the new example recipe you added.

[jusx]

@samj1912 Would you mind adding tests for scenarios with the empty validationSuite array? I'll merge it if you push the added tests to this PR.

Let me know if you want to open a separate PR for the tests. I'd be OK with that as well.