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[FIX] bundle/Builder: Skip source map for empty or trivia-only files

Follow-up of https://github.com/SAP/ui5-builder/pull/1014

Providing an "AAAA" mapping for empty files or files containing only
comments produces a warning in the Safari browser, which then ignores
the whole source map:

> Source Map "[...]library-preload.js.map" has invalid "mappings"

To resolve this, do not create any mapping for such files. In my
testing, the behavior in Chrome appears to be the same with and without
the mapping.

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