Handle falsy values in data.

[thchia]

For #116.

Problem

The templater is supposed to replace the placeholder parts of the translation string with the interpolated data. It will skip over the parts of the translation string that are not placeholders. It does this by setting a matched variable with the interpolated data, or leaving it undefined if there is no interpolation needed. Currently it fails to detect if the interpolated data is falsy (0, ""), and thus returns the literal string in the translation.

Changes

I have made it detect any data value except undefined, so you can pass 0 or an empty string in the data and have it render correctly.

[codecov]

Codecov Report

Merging #117 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
+ Coverage   95.56%   95.58%   +0.01%     
==========================================
  Files           6        6              
  Lines         248      249       +1     
  Branches       75       75              
==========================================
+ Hits          237      238       +1     
  Misses         10       10              
  Partials        1        1

Impacted Files	Coverage Δ
src/utils.js	100% <100%> (ø)	⬆️

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[ryandrewjohnson]

Looks good! Merged!