Protect against fatal YellowBox error when stack frame has no file #13512
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Motivation: When viewing a stack trace in YellowBox where one or more of the stack frames has no
file
, JS will encounter the fatal errornull is not an object (evaluating 'file.split')
. This can happen, for example, when running a bundle for which no source maps were generated.Test plan: Send a stack trace with empty stack frames to
console.warn
, for example by turning off source maps.