git-kanban loses URL when configuring labels

[silmaril42]

This issue is:

• [x ] Bug report

Actual behaviour

When I configure labels in the kanban board, git-kanban loses the configured git URL and stops working.

Expected behaviour

The URL should stay in the config and git-kanban should use the configured labels.

Steps to reproduce

• add local gitea server with URL gitea:3000
• configure auth token
• refresh gitea in firefox => kanban board shows up
• click "Settings"
• configure some labels
• refresh gitea page
  • Kanban board is gone
  • in git-kanban the remote git server shows still up but there is no URL

Configuration

• Extension Id Used (self hosted vs simple): self hosted
• Is the domain a root or a subdirectory path ( e.g. gitea.mywebsite.com or mywebsite.com/gitea): root: gitea:3000
• Site Access in More Tools > Extensions, Extension Details (all sites, On specific sites - whitelist list): all sites
• Browser: Firefox 73.0
• OS: Linux