Fix notifications with an empty HEAD report

There were a couple of errors spread around the notification code assuming that a `head.report` always exists, which is not necessarily the case.

In particular that would be the case when using `empty-upload` or `manual_trigger`.

services/notification/notifiers/codecov_slack_app.py

@@ -84,6 +84,7 @@ def build_payload(self, comparison: ComparisonProxy) -> dict:
             message = "unknown"
             notation = ""
             comparison_url = None
+        head_report = comparison.head.report
         return {
             "url": comparison_url,
             "message": message,
@@ -99,7 +100,7 @@ def build_payload(self, comparison: ComparisonProxy) -> dict:
                 if comparison.project_coverage_base
                 else None
             ),
-            "head_totals_c": str(comparison.head.report.totals.coverage),
+            "head_totals_c": str(head_report.totals.coverage) if head_report else "0",
         }
 
     def notify(self, comparison: ComparisonProxy) -> NotificationResult:

services/notification/notifiers/mixins/status.py

@@ -303,8 +303,10 @@ def get_project_status(
     def _get_project_status(
         self, comparison: ComparisonProxy | FilteredComparison
     ) -> tuple[str, str]:
-        head_report_totals = comparison.head.report.totals
-        if head_report_totals.coverage is None:
+        if (
+            not comparison.has_head_report()
+            or (head_report_totals := comparison.head.report.totals) is None
+        ):
             state = self.notifier_yaml_settings.get("if_not_found", "success")
             message = "No coverage information found on head"
             return (state, message)

tasks/notify.py

@@ -346,6 +346,7 @@ def run_impl_within_lock(
                 and not self.send_notifications_if_commit_differs_from_pulls_head(
                     commit, enriched_pull, current_yaml
                 )
+                and empty_upload is None
             ):
                 log.info(
                     "Not sending notifications for commit when it differs from pull's most recent head",
@@ -531,7 +532,10 @@ def save_patch_totals(self, comparison: ComparisonProxy) -> None:
         This is done to make sure the patch coverage reported by notifications and UI is the same
         (because they come from the same source)
         """
-        if comparison.comparison.patch_coverage_base_commitid is None:
+        if (
+            comparison.comparison.patch_coverage_base_commitid is None
+            or not comparison.has_head_report()
+        ):
             # Can't get diff to calculate patch totals
             return
         head_commit = comparison.head.commit

tasks/tests/integration/test_notify_task.py

@@ -2,7 +2,7 @@
 from unittest.mock import patch
 
 import pytest
-from mock import PropertyMock
+from mock import AsyncMock, PropertyMock
 from shared.validation.types import CoverageCommentRequiredChanges
 
 from database.models import Pull
@@ -11,6 +11,7 @@
 from services.archive import ArchiveService
 from services.comparison import get_or_create_comparison
 from services.notification.notifiers.base import NotificationResult
+from services.repository import EnrichedPull
 from tasks.notify import NotifyTask
 
 sample_token = "ghp_test6ldgmyaglf73gcnbi0kprz7dyjz6nzgn"
@@ -1314,3 +1315,82 @@ def test_notifier_call_no_head_commit_report(
             "reason": "no_head_report",
         }
         assert result == expected_result
+
+    @patch("requests.post")
+    def test_notifier_call_no_head_commit_report_empty_upload(
+        self,
+        mock_post_request,
+        dbsession,
+        mocker,
+        codecov_vcr,
+        mock_storage,
+        mock_configuration,
+        mock_repo_provider,
+    ):
+        mock_configuration.params["setup"]["codecov_dashboard_url"] = (
+            "https://codecov.io"
+        )
+        mocked_app = mocker.patch.object(NotifyTask, "app")
+        repository = RepositoryFactory.create(
+            owner__unencrypted_oauth_token=sample_token,
+            owner__username="ThiagoCodecov",
+            owner__service="github",
+            owner__service_id="44376991",
+            name="example-python",
+        )
+        dbsession.add(repository)
+        dbsession.flush()
+        master_commit = CommitFactory.create(
+            message="",
+            pullid=None,
+            branch="master",
+            commitid="17a71a9a2f5335ed4d00496c7bbc6405f547a527",
+            repository=repository,
+        )
+        commit = CommitFactory.create(
+            message="",
+            pullid=1234,
+            branch="test-branch-1",
+            commitid="649eaaf2924e92dc7fd8d370ddb857033231e67a",
+            repository=repository,
+            _report_json=None,
+        )
+        dbsession.add(commit)
+        dbsession.add(master_commit)
+        dbsession.flush()
+        pull = PullFactory.create(
+            repository=repository,
+            pullid=1234,
+            head=commit.commitid,
+            base=master_commit.commitid,
+        )
+        dbsession.add(pull)
+        dbsession.flush()
+        task = NotifyTask()
+        with open("tasks/tests/samples/sample_chunks_1.txt") as f:
+            content = f.read().encode()
+            archive_hash = ArchiveService.get_archive_hash(commit.repository)
+            master_chunks_url = (
+                f"v4/repos/{archive_hash}/commits/{master_commit.commitid}/chunks.txt"
+            )
+            mock_storage.write_file("archive", master_chunks_url, content)
+
+        mocker.patch("tasks.notify.NotifyTask.fetch_and_update_whether_ci_passed")
+        mocker.patch(
+            "tasks.notify.fetch_and_update_pull_request_information_from_commit",
+            return_value=EnrichedPull(database_pull=pull, provider_pull=None),
+        )
+        mock_repo_provider.get_commit_statuses = AsyncMock(return_value=None)
+
+        result = task.run_impl_within_lock(
+            dbsession,
+            repoid=commit.repoid,
+            commitid=commit.commitid,
+            current_yaml={"coverage": {"status": {"project": True}}},
+            empty_upload="pass",
+        )
+
+        assert result["notified"]
+        assert len(result["notifications"]) == 2
+        assert result["notifications"][0]["result"] is not None
+        assert result["notifications"][1]["result"] is not None