Chris Bracken fff4720f2c Verify RunConfiguration is valid before running (flutter/engine#6922)
In cases where a valid IsolateConfiguration cannot be inferred, (e.g.,
settings.kernel_list_asset is missing) RunConfiguration can be created
with a null IsolateConfiguration. In such cases, bail out early with
kInvalidSettings.

Also adds a redundant paranoid check to EmbedderEngine::Run.
2018-12-16 14:07:42 -08:00
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