### Please describe the problem.
After adding a `gcrypt::rsync://` remote, `git-annex-sync` and `git-annex-info` crash with:

    git-annex: bad url rsync://192.168.178.241:test
    CallStack (from HasCallStack):
      error, called at ./Git/Construct.hs:107:15 in main:Git.Construct

### What steps will reproduce the problem?
    git init
    git annex init test
    git remote add test gcrypt::rsync://192.168.178.241:test
    git annex sync

### What version of git-annex are you using? On what operating system?
git-annex version: 8.20201127

> [[done]], it will no longer crash, and git-annex sync will work
> --[[Joey]]
