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Context
The router makes an API request for the latest open PR when one may not exist. In the absence of any open pull requests, the API request should not be made. There is also an additional invalid dereference for extracting the SHA from an invalid event.
Objective
References
screwdriver-cd/screwdriver#3200
License
I confirm that this contribution is made under the terms of the license found in the root directory of this repository's source tree and that I have the authority necessary to make this contribution on behalf of its copyright owner.