Fix failure with missing readme. #8353
Merged
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#8277 added implicit README support, but it also rejected parsing any manifest where the README was missing. This causes a problem because the README is often missing in many registry packages (for various reasons).
This removes the validation at parsing time. Cargo has historically not had hard enforcement at the parsing stage. Whether or not the readme exists has always been enforced during publishing. I have added some extra context to the error message, and added a test to that effect.
Fixes #8351