Sorin Sbarnea d27c7ff9db Improve errors from update-test-platforms
Instead of getting a confusing stacktrace when someone adds a new
file that is missing the final project entry we now give a friendlier
error that also recommends way to address the issue.

Change-Id: I5a84d3a20e847eeb2d5d843ef970b5790532683c
2020-10-25 23:18:30 +00:00
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