Merge branch 'small-fixes' into 'master'

Small fixes

Improve application stability over unexpected cases

See merge request !1310

app/views/projects/merge_requests/show/_state_widget.html.haml

@@ -19,7 +19,9 @@
 
     - if @merge_request.merged?
       %h4
-        Merged by #{link_to_member(@project, @merge_request.merge_event.author, avatar: false)}
+        Merged
+        - if @merge_request.merge_event
+          by #{link_to_member(@project, @merge_request.merge_event.author, avatar: false)}
           #{time_ago_with_tooltip(@merge_request.merge_event.created_at)}
       = render "projects/merge_requests/show/remove_source_branch"
 
@@ -46,4 +48,3 @@
         Accepting this merge request will close #{@closes_issues.size == 1 ? 'issue' : 'issues'}
         = succeed '.' do
           != gfm(issues_sentence(@closes_issues))
-

lib/gitlab/git_access.rb

@@ -49,8 +49,17 @@ module Gitlab
     end
 
     def push_access_check(user, project, changes)
-      return build_status_object(false, "You don't have access") unless user && user_allowed?(user)
-      return build_status_object(true) if changes.blank?
+      unless user && user_allowed?(user)
+        return build_status_object(false, "You don't have access")
+      end
+
+      if changes.blank?
+        return build_status_object(true)
+      end
+
+      unless project.repository.exists?
+        return build_status_object(false, "Repository does not exist")
+      end
 
       changes = changes.lines if changes.kind_of?(String)
 
@@ -79,7 +88,7 @@ module Gitlab
                  else
                    :push_code_to_protected_branches
                  end
-               elsif project.repository && project.repository.tag_names.include?(tag_name(ref))
+               elsif project.repository.tag_names.include?(tag_name(ref))
                  # Prevent any changes to existing git tag unless user has permissions
                  :admin_project
                else