fix(ci): Skip checking status of non-existent pull request

Prevent failures in the "Check PR Review State" by not checking the
status when there is no pull request in the Update workflow.

Signed-off-by: Erik Swanson <[email protected]>

Author: eriksw

.github/workflows/update.yaml

@@ -90,6 +90,7 @@ jobs:
           gh pr merge --auto --squash "${{ steps.create-pull-request.outputs.pull-request-number }}"
       - name: Check PR Review State
         id: review
+        if: ${{ steps.create-pull-request.outputs.pull-request-number }}
         env:
           GH_TOKEN: ${{ steps.generate-token.outputs.token }}
         run: |