gitea: **Whitelist-Push** and **MergePullrequest** does not work when Branch-Protection is enabled

• Gitea version (or commit ref): 1.9.0+3-g6d441de
• Go Version 1.11.5
• Git version: 2.7.4
• Operating system: LXC container on ubuntu 16.04 LTS
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist:

Description

Whitelist-Push and MergePullrequest does not work when Branch-Protection is enabled:

Pushing develop
Enumerating objects: 7, done.
Delta compression using up to 12 threads
Total 4 (delta 3), reused 0 (delta 0)
POST git-receive-pack (530 bytes)
Remote: Gitea: Internal Server Error        
Remote: Fail to detect force push: exit status 128 - fatal: Not a git repository (or any parent up to mount point /srv/git)        
Remote: Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).        
Remote: 
Pushing to myserver
To myserver
Error: failed to push some refs to 'myserver'

Merging Pullrequests returns 500 Error

With Gitea 1.8.3+2-g11f6ed4 everything works just fine.

Screenshots