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file_packager: preloadFallback may not be triggered in QuotaExceeded scenarios #21327

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Description

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In certain scenarios (such as when quota is exceeded), it's possible for:

  1. A metadata entry to exist (i.e. checkCachedPackage() calls its success callback),
  2. But the package data to be missing (so fetchCachedPackage()'s onsuccess handler receives an event.target.result that's undefined)

Expected behavior:

fetchCachedPackage()'s errback gets called, so that the preloadFallback gets triggered

Current behavior:

An unhandled exception gets thrown

Version of emscripten/emsdk:
3.1.53

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