fix(autofix): Fix PR paginated list schenanigans (#2190)

pulls because it's a `PaginatedList` it evaluates to true when empty....

Author: jennmueng

src/seer/automation/codebase/repo_client.py

@@ -682,7 +682,9 @@ def create_pr_from_branch(
         description: str,
         provided_base: str | None = None,
     ) -> PullRequest:
-        if pulls := self.repo.get_pulls(state="open", head=f"{self.repo_owner}:{branch.ref}"):
+        pulls = self.repo.get_pulls(state="open", head=f"{self.repo_owner}:{branch.ref}")
+
+        if pulls.totalCount > 0:
             logger.error(
                 f"Branch {branch.ref} already has an open PR.",
                 extra={