finish it up with all todos

bert_e/tests/test_bert_e.py

@@ -744,6 +744,17 @@ def test_major_development_branch_no_tag_bump(self):
         fixver = ['4.3.19', '4.4.0', '5.1.5', '10.0.0', '10.1.0']
         self.finalize_cascade(branches, tags, destination, fixver)
 
+    def test_major_dev_branch_lonely_stab(self):
+        destination = 'stabilization/6.1.5'
+        branches = OrderedDict({
+            1: {'name': 'stabilization/6.1.5', 'ignore': False},
+            2: {'name': 'development/6', 'ignore': False}
+        })
+        tags = []
+        fixver = ['6.1.5', '6.2.0']
+        with self.assertRaises(exns.DevBranchDoesNotExist):
+            self.finalize_cascade(branches, tags, destination, fixver)
+
     def test_retry_handler(self):
         class DummyError(Exception):
             pass

bert_e/workflow/gitwaterflow/branches.py

@@ -1031,11 +1031,6 @@ def _set_target_versions(self, dst_branch):
                 self.target_versions.append('%d.%d.%d' % (
                     major, minor, dev_branch.micro + offset))
             elif dev_branch and dev_branch.has_minor is False:
-                # TODO: handle case with stab/x.y.z with no dev/x.y
-                # -> no need as stab/x.y.z cannot exist without a dev/x.y
-                # TODO: handle case where dev/1 and dev/1.0 exists
-                # but no 1.0.0 tag
-                # -> Should return 1.0.0 only
                 self.target_versions.append(
                     f"{major}."
                     f"{dev_branch.latest_minor + 1}."