Fix js error

[cenkingunlugu]

Fix js error when there is no structuredText of startLine or structuredText of startLine has not text attribute.

Also fixes this issueon karma-coverage: karma-runner/karma-coverage#167

[coveralls]

Coverage remained the same at 97.523% when pulling aeed316 on cenkingunlugu:master into bc84c31 on gotwarlost:master.

[cenkingunlugu]

Also solves: #817

[FezVrasta]

I fear this is just avoiding the error but not fixing the underlying problem

[glazar]

I have a PR for only part of these changes. These should be linked.

[dmi3y]

Does anyone figured why this happening? In my case, doing migration js>ts(x) and just started to seeing this error. Assuming some upstream is screwing the sourcemaps (webpack + babel (react) + typescript + karma)?

[mebibou]

@FezVrasta yes this is not a fix, it's just a "silent" fail. I think there should be an error thrown instead that just looks better than "TypeError", which would tell you that the coverage report cannot be mapped to the source file.
In my case, this happens because I am using TypeScript and so the coverage does not really cover the source file. I'm trying to switch and use karma-typescript with coverage to make it work but been quite unsuccessful so far

[spencerdavis2000]

This fix works perfectly.
Can this get merged?

[fp-Kuba]

+1 👍