Bail on empty objects sent to the tagGenerator function

[Livog]

Noticed that sometimes I get an empty object sent here and it makes the vue-meta print out empty tags with no value what so ever. Maybe there is a reason why there is no check for an empty object. I know there should not be empty objects sent here but if something does, it will at least not print empty tags. :)

Let me know if this a good or bad idea.

[TheAlexLichter]

@Livog Please fix the linting issue ☺️

[codecov]

Codecov Report

Merging #286 into master will decrease coverage by 0.15%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
- Coverage    40.3%   40.15%   -0.16%     
==========================================
  Files          18       18              
  Lines         263      264       +1     
==========================================
  Hits          106      106              
- Misses        157      158       +1

Impacted Files	Coverage Δ
src/server/generators/tagGenerator.js	0% <0%> (ø)	⬆️

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