bcr_presubmit: block the pipeline for BCR maintainer review even when follow up jobs are empty (#2210)

Author: meteorcloudy

buildkite/bazel-central-registry/bcr_presubmit.py

@@ -540,7 +540,7 @@ def main(argv=None):
             if len(pipeline_steps) == previous_size:
                 error("No pipeline steps generated for %s@%s. Please check the configuration." % (module_name, module_version))
 
-        if should_wait_bcr_maintainer_review(modules) and pipeline_steps:
+        if should_wait_bcr_maintainer_review(modules):
             pipeline_steps.insert(0, {"block": "Wait on BCR maintainer review", "blocked_state": "running"})
 
         upload_jobs_to_pipeline(pipeline_steps)