Export path to a js dep when it has no loader associated

[pierredavidbelanger]

This fixes the fact that an HTML dependency of a JS asset was wrongly written in the JS as an (not working) bundle loader that could make an app crash at runtime with a message like : Cannot find module '6'.

This is one of the two points (required to be able to do require('./other.html')) mentioned in this comment

[pierredavidbelanger]

I am not sure I did this one correctly.

You can see this only as a proof that this problem can be fixed and to have a better view at it.
I guess someone with a better understanding of the codebase will be able to refactor my mess with something beautiful.

For now I, myself, see it as a good enough temporary fix ;)

[codecov-io]

Codecov Report

Merging #1017 into master will decrease coverage by 0.83%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1017      +/-   ##
==========================================
- Coverage   89.06%   88.22%   -0.84%     
==========================================
  Files          68       68              
  Lines        3438     3254     -184     
==========================================
- Hits         3062     2871     -191     
- Misses        376      383       +7

Impacted Files	Coverage Δ
src/packagers/JSPackager.js	87.37% <0%> (-2.63%)	⬇️
src/transforms/posthtml.js	80.48% <0%> (-19.52%)	⬇️
src/assets/CSSAsset.js	81.73% <0%> (-8.7%)	⬇️
src/assets/ReasonAsset.js	91.66% <0%> (-8.34%)	⬇️
src/transforms/babel.js	87.37% <0%> (-6.8%)	⬇️
src/visitors/dependencies.js	80.51% <0%> (-6.5%)	⬇️
src/assets/GlobAsset.js	93.33% <0%> (-5.34%)	⬇️
src/utils/installPackage.js	61.9% <0%> (-3.18%)	⬇️
src/assets/HTMLAsset.js	85.1% <0%> (-2.13%)	⬇️
src/utils/getTargetEngines.js	95.5% <0%> (-1.13%)	⬇️
... and 12 more

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