Fix upgrade-proposals linter bug for multiple releases

The new upgrade-proposals linter threw an error if there were multiple releases being upgraded at the same time. This is an intended feature, so that is being removed from the linter in this commit.

komodo/lint_upgrade_proposals.py

@@ -7,11 +7,11 @@ def verify_package_versions_exist(
     upgrade_proposals: UpgradeProposalsFile,
     repository: RepositoryFile,
 ) -> None:
-    releases_with_upgrades_counter = 0
+    found_release_with_upgrades = False
     for proposed_package_upgrades in upgrade_proposals.content.values():
         if proposed_package_upgrades is None:
             continue
-        releases_with_upgrades_counter += 1
+        found_release_with_upgrades = True
         errors = []
         for (
             upgrade_proposals_package,
@@ -27,14 +27,13 @@ def verify_package_versions_exist(
                     f" {upgrade_proposals_package_version} in repository",
                 )
             except KomodoException as e:
-                errors.append(e.error)
+                errors.append("ERROR: " + e.error)
         if errors:
             raise SystemExit("\n".join(errors))
-    if releases_with_upgrades_counter == 0:
+    if found_release_with_upgrades:
         print("No upgrades found")
-    if releases_with_upgrades_counter > 1:
-        msg = "Found upgrades for more than one release"
-        raise SystemExit(msg)
+    else:
+        print("Found upgrades")
 
 
 def get_args() -> argparse.ArgumentParser:

tests/test_lint_upgrade_proposals.py

@@ -95,6 +95,13 @@ def does_not_raise():
 1111-12:
   python: 3.8.6
 """
+
+INVALID_UPGRADE_PROPOSALS_PACKAGE_NOT_IN_REPOSITORY = """
+1111-11:
+1111-12:
+  testlib: 3.8.6
+"""
+
 VALID_EMPTY_UPGRADE_PROPOSALS = """
 1111-11:
 1111-12:
@@ -189,10 +196,7 @@ def does_not_raise():
         pytest.param(
             VALID_UPGRADE_PROPOSALS_MULTIPLE_RELEASES,
             VALID_REPOSITORY,
-            pytest.raises(
-                SystemExit,
-                match=r"Found upgrades for more than one release",
-            ),
+            does_not_raise(),
             id="upgrades_in_multiple_releases_in_upgrade_proposals",
         ),
         pytest.param(
@@ -246,6 +250,15 @@ def does_not_raise():
             ),
             id="invalid_upgrade_proposals_float_package_version",
         ),
+        pytest.param(
+            INVALID_UPGRADE_PROPOSALS_PACKAGE_NOT_IN_REPOSITORY,
+            VALID_REPOSITORY,
+            pytest.raises(
+                SystemExit,
+                match=r"ERROR: Package 'testlib' not found in repository",
+            ),
+            id="invalid_upgrade_proposals_float_package_version",
+        ),
     ],
 )
 def test_lint(