fix: do not throw error if race condition cannot be detected due to m…

…issing branch

src/manifest.ts

@@ -1254,9 +1254,11 @@ export class Manifest {
         }
       } catch (err: unknown) {
         if (isOctokitRequestError(err) && err.status === 404) {
-          throw new Error(
+          // note: this really should trigger an alert of some sort, but that's not yet a thing
+          this.logger.error(
             `Branch comparison between '${pr.headBranchName}' and '${branchName.changesBranch}' failed due to a missing branch. As a result branches '${pr.baseBranchName}' and '${branchName.changesBranch}' won't be re-aligned which may result in git conflicts when the next release PR is created. Note: the release branch '${pr.headBranchName}' used for the PR ${pr.number} has likely been deleted manually before the release process could run, resulting in this error.`
           );
+          return;
         }
       }