fix:Cannot read property js of null

[80245089]

I modify the method addAsset in JSPackager.js the source is
if (asset.generated == null) {
return;
}

Close #1158 #1227

[codecov-io]

Codecov Report

Merging #1248 into master will decrease coverage by 0.39%.
The diff coverage is 50%.

@@            Coverage Diff            @@
##           master    #1248     +/-   ##
=========================================
- Coverage   87.38%   86.98%   -0.4%     
=========================================
  Files          77       77             
  Lines        4105     4034     -71     
=========================================
- Hits         3587     3509     -78     
- Misses        518      525      +7

Impacted Files	Coverage Δ
src/packagers/JSPackager.js	87.85% <50%> (-0.73%)	⬇️
src/utils/promisify.js	88.88% <0%> (-11.12%)	⬇️
src/visitors/fs.js	79.86% <0%> (-6.25%)	⬇️
src/utils/installPackage.js	89.65% <0%> (-3.75%)	⬇️
src/utils/pipeSpawn.js	92.3% <0%> (-3.15%)	⬇️
src/assets/JSAsset.js	90.9% <0%> (-3.04%)	⬇️
src/assets/GraphqlAsset.js	100% <0%> (ø)	⬆️
src/transforms/babel.js	88.55% <0%> (+0.49%)	⬆️
src/Logger.js	96.84% <0%> (+1.05%)	⬆️
src/utils/PromiseQueue.js	94.23% <0%> (+3.44%)	⬆️
... and 1 more

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[DeMoorJasper]

@80245089 would be nice to have a minimal reproduction test case for this as well :)

[devongovett]

Yeah I'd rather solve the actual problem rather than patch fixing.asset.generated should never be null.