Michael Prentice 72eba7745f fix(service-worker): ensure initialization before handling messages (#32525)
- resolves "Invariant violated (initialize): latest hash null has no known manifest"
- Thanks to @gkalpak and @hsta for helping test and investigate this fix

Fixes #25611

PR Close #32525
2019-10-31 22:55:35 +00:00
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