git-town panics on branch rename

[breml]

Steps to reproduce

1. create branch (in this case, I created the branch without git-town: git checkout -b branch-name)
2. commit on the newly created branch
3. push the branch to origin
4. rename the branch with git town rename-branch new-name (while still having the branch, that is renamed, checked out)

Command output

...

[new-name] git branch -D branch-name
Deleted branch branch-name (was 3eb5f4b6f).
panic: local branch names cannot be empty

goroutine 1 [running]:
github.com/git-town/git-town/v14/src/git/gitdomain.NewLocalBranchName(...)
        D:/a/git-town/git-town/src/git/gitdomain/local_branch_name.go:14
github.com/git-town/git-town/v14/src/config/gitconfig.AddKeyToPartialConfig({0xc0027a5e35, 0x35}, {0xc0027a5e35, 0x0}, 0xc000e4f1a8)
        D:/a/git-town/git-town/src/config/gitconfig/access.go:41 +0x183a
github.com/git-town/git-town/v14/src/config/gitconfig.(*Access).load(0xc000e4f458, 0x0, 0x0)
        D:/a/git-town/git-town/src/config/gitconfig/access.go:253 +0x556
github.com/git-town/git-town/v14/src/config/gitconfig.(*Access).LoadLocal(...)
        D:/a/git-town/git-town/src/config/gitconfig/access.go:32
github.com/git-town/git-town/v14/src/vm/interpreter/full.finished({0xc000170c18, {0x0, 0x0}, 0xc0000be428, 0x0, {{0xc000f24667, 0x1e}, {0xc0016d4008, 0xf0, 0x133}}, ...})
        D:/a/git-town/git-town/src/vm/interpreter/full/finished.go:25 +0x225
github.com/git-town/git-town/v14/src/vm/interpreter/full.Execute({0xc000170c18, {0x0, 0x0}, 0xc0000be428, 0x0, {{0xc000f24667, 0x1e}, {0xc0016d4008, 0xf0, 0x133}}, ...})
        D:/a/git-town/git-town/src/vm/interpreter/full/execute.go:20 +0x31a
github.com/git-town/git-town/v14/src/cmd.executeRenameBranch({0xc000038a70, 0x1, 0x1}, 0x0, 0x0, 0x0)
        D:/a/git-town/git-town/src/cmd/rename_branch.go:88 +0x458
github.com/git-town/git-town/v14/src/cmd.renameBranchCommand.func1(0xc000164608, {0xc000038a70, 0x1, 0x1})
        D:/a/git-town/git-town/src/cmd/rename_branch.go:52 +0x8a
github.com/spf13/cobra.(*Command).execute(0xc000164608, {0xc000038a40, 0x1, 0x1})
        D:/a/git-town/git-town/vendor/github.com/spf13/cobra/command.go:983 +0xaca
github.com/spf13/cobra.(*Command).ExecuteC(0xc00013c308)
        D:/a/git-town/git-town/vendor/github.com/spf13/cobra/command.go:1115 +0x3ff
github.com/spf13/cobra.(*Command).Execute(...)
        D:/a/git-town/git-town/vendor/github.com/spf13/cobra/command.go:1039
github.com/git-town/git-town/v14/src/cmd.Execute()
        D:/a/git-town/git-town/src/cmd/core.go:38 +0x619
main.main()
        D:/a/git-town/git-town/main.go:18 +0x1e

### Additional information

Git Town 14.2.0

[kevgo]

Thanks for this detailed bug report! I'm in the middle of an effort to make the type checks much more strict, which should eliminate bugs like this one once and for all!

[kevgo]

This bug was a result of too loose type handling. The new stricter type checking is implemented now, and as a side effect this bug seems to be fixed. Please comment or reopen if you still run into it with versions newer than 14.2.0. Thanks!