getSourceMapContent more robust: `''` ended up in the `urls` array breaking build#314

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dproft wants to merge 1 commit intoember-cli:masterfrom

dproft:make-sure-srcURLs-are-truthy

Commits on Oct 17, 2023

make sure srcURLs are truthy. see https://github.com/meirish/broccoli-uglify-sourcemap/commit/0395cb1097ff5b90d77b6a1daf68ece96cd8be47
dproft
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