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What?
The change fixes a panic by returning nil instead of erroring.
Why?
If the frame is nil at this point, then the cause of this is likely due to chrome not sending a frameAttached event ahead of time. This isn't a bug in chrome, and seems to be intended behavior. Instead of worrying about the nil frame and causing the test to fail when the frame is nil, we can instead return early. The frame will be initialized when getFrameTree CDP request is made, which will call onFrameAttached and onFrameNavigated.
Checklist
Related PR(s)/Issue(s)
#1500