Unable to add default webhook for Telegram

[rchavik]

• Gitea version (or commit ref): 1.9.1
• Git version: 2.7.4
• Operating system: Linux 4.4.0-116-generic 140-Ubuntu SMP Mon Feb 12 21:23:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
• 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

Tried adding Telegram as a default webhook resulted in a empty tab pane:

Site Administration -> Default Webhooks -> Add Webhook -> Telegram

Note: Adding Telegram webhook manually by repository does work.

Screenshots

[gary-kim]

Looks like that was forgotten when the webhook was added. I'll make a PR with a fix.