Ignore images with missing brew nvr data

Images built and released by Konflux lack Brew metadata. Freshmaker
will encounter problems, because it currently expects this data.

This commit makes Freshmaker ignore those images. This is done in
`images.PyxisAPI.find_images_with_included_rpms`, right after querying pyxis,
by checking the brew nvr field.

freshmaker/image.py

@@ -726,6 +726,10 @@ def find_images_with_included_rpms(
         if not images:
             return []
 
+        # Skip images without Brew metadata. Images built and released by Konflux
+        # lack Brew metadata. We don't support rebuilding such images.
+        images = [x for x in images if x["brew"]]
+
         # Avoid manipulating the images directly, use a copy instead
         image_dicts = copy.deepcopy(images)
         del images

tests/test_image.py

@@ -1427,6 +1427,56 @@ def test_images_with_included_newer_srpm_multilpe_nvrs(self, exists, mocked_clie
         )
         self.assertEqual([image.nvr for image in ret], ["parent-1-3", "parent-1-2"])
 
+    @patch("freshmaker.pyxis_gql.Client")
+    def test_images_with_missing_nvr_data(self, mock_pyxis_client):
+        mock_pyxis_client.return_value.execute.return_value = {
+            "find_images": {
+                "data": [
+                    {
+                        "architecture": "amd64",
+                        "brew": None,
+                        "content_sets": ["dummy-content-set-1"],
+                        "edges": {
+                            "rpm_manifest": {
+                                "data": {
+                                    "rpms": [
+                                        {
+                                            "name": "openssl",
+                                            "nvra": "openssl-1.2.3-2.amd64",
+                                            "srpm_name": "openssl",
+                                            "srpm_nevra": "openssl-1.2.3-2.amd64",
+                                        }
+                                    ]
+                                }
+                            }
+                        },
+                        "parent_brew_build": "ubi8-minimal-container-8.6-100.1582220001",
+                        "parsed_data": {},
+                        "repositories": [
+                            {
+                                "published": True,
+                                "registry": "registry.example.com",
+                                "repository": "product/repo1",
+                                "tags": [{"name": "latest"}],
+                            }
+                        ],
+                    }
+                ],
+                "error": None,
+                "page": 0,
+                "page_size": 250,
+                "total": 2,
+            }
+        }
+        pyxis = PyxisAPI(server_url=self.fake_server_url)
+        repositories = {
+            repo["repository"]: repo for repo in self.fake_repositories_with_content_sets
+        }
+        ret = pyxis.find_images_with_included_rpms(
+            ["dummy-content-set-1"], ["openssl-1.2.4-2"], repositories
+        )
+        self.assertEqual([], ret)
+
     def _filter_fnc(self, image):
         return image.nvr.startswith("filtered_")