diff --git a/kallithea/controllers/changeset.py b/kallithea/controllers/changeset.py
--- a/kallithea/controllers/changeset.py
+++ b/kallithea/controllers/changeset.py
@@ -27,30 +27,28 @@ Original author and date, and relevant c
 
 import logging
 import traceback
-from collections import defaultdict
+from collections import OrderedDict, defaultdict
 
-from tg import tmpl_context as c, request, response
+from tg import request, response
+from tg import tmpl_context as c
 from tg.i18n import ugettext as _
-from webob.exc import HTTPFound, HTTPForbidden, HTTPBadRequest, HTTPNotFound
-
-from kallithea.lib.vcs.exceptions import RepositoryError, \
-    ChangesetDoesNotExistError, EmptyRepositoryError
+from webob.exc import HTTPBadRequest, HTTPForbidden, HTTPFound, HTTPNotFound
 
 import kallithea.lib.helpers as h
-from kallithea.lib.auth import LoginRequired, HasRepoPermissionLevelDecorator
-from kallithea.lib.base import BaseRepoController, render, jsonify
+from kallithea.lib import diffs
+from kallithea.lib.auth import HasRepoPermissionLevelDecorator, LoginRequired
+from kallithea.lib.base import BaseRepoController, jsonify, render
+from kallithea.lib.graphmod import graph_data
 from kallithea.lib.utils import action_logger
-from kallithea.lib.compat import OrderedDict
-from kallithea.lib import diffs
+from kallithea.lib.utils2 import safe_unicode
+from kallithea.lib.vcs.backends.base import EmptyChangeset
+from kallithea.lib.vcs.exceptions import ChangesetDoesNotExistError, EmptyRepositoryError, RepositoryError
+from kallithea.model.changeset_status import ChangesetStatusModel
+from kallithea.model.comment import ChangesetCommentsModel
 from kallithea.model.db import ChangesetComment, ChangesetStatus
-from kallithea.model.comment import ChangesetCommentsModel
-from kallithea.model.changeset_status import ChangesetStatusModel
 from kallithea.model.meta import Session
 from kallithea.model.pull_request import PullRequestModel
-from kallithea.model.repo import RepoModel
-from kallithea.lib.vcs.backends.base import EmptyChangeset
-from kallithea.lib.utils2 import safe_unicode
-from kallithea.lib.graphmod import graph_data
+
 
 log = logging.getLogger(__name__)
 
@@ -208,7 +206,7 @@ def create_cs_pr_comment(repo_name, revi
             h.HasPermissionAny('hg.admin')() or
             h.HasRepoPermissionLevel('admin')(pull_request.org_repo.repo_name) or
             h.HasRepoPermissionLevel('admin')(pull_request.other_repo.repo_name)
-            ) and not pull_request.is_closed():
+        ) and not pull_request.is_closed():
             PullRequestModel().delete(pull_request)
             Session().commit()
             h.flash(_('Successfully deleted pull request %s') % pull_request_id,