fix required repo_type param on repo edit form

rhodecode/controllers/admin/repos.py

@@ -254,11 +254,15 b' class ReposController(BaseRepoController'
         choices, c.landing_revs = ScmModel().get_repo_landing_revs(repo_name)
         c.landing_revs_choices = choices
         repo = Repository.get_by_repo_name(repo_name)
-        _form = RepoForm(edit=True, old_data={'repo_name': repo_name,
-                                              'repo_group': repo.group.get_dict() \
-                                              if repo.group else {}},
+        old_data = {
+            'repo_name': repo_name,
+            'repo_group': repo.group.get_dict() if repo.group else {},
+            'repo_type': repo.repo_type,
+        }
+        _form = RepoForm(edit=True, old_data=old_data,
                          repo_groups=c.repo_groups_choices,
                          landing_revs=c.landing_revs_choices)()
+
         try:
             form_result = _form.to_python(dict(request.POST))
             repo = repo_model.update(repo_name, **form_result)

rhodecode/model/forms.py

@@ -184,7 +184,8 b' def RepoForm(edit=False, old_data={}, su'
                         v.SlugifyName())
         repo_group = All(v.CanWriteGroup(old_data),
                          v.OneOf(repo_groups, hideList=True))
-        repo_type = v.OneOf(supported_backends)
+        repo_type = v.OneOf(supported_backends, required=False,
+                            if_missing=old_data.get('repo_type'))
         repo_description = v.UnicodeString(strip=True, min=1, not_empty=False)
         repo_private = v.StringBoolean(if_missing=False)
         repo_landing_rev = v.OneOf(landing_revs, hideList=True)