[Fix] Check null value for channelMatch within getAuthor from utils

[kelyvin]

To address issue: #349

[codecov]

Codecov Report

Merging #350 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #350   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         605    608    +3     
  Branches      149    152    +3     
=====================================
+ Hits          605    608    +3

Impacted Files	Coverage Δ
lib/util.js	100% <100%> (ø)	⬆️

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[fent]

Thanks!