Handle deleted+untracked files

[noahp]

If a file is deleted, staged, then added back, we crash:

❯ git rm README.md
❯ echo "heyo" >> README.md
❯ ./bin/git-status-tree
Traceback (most recent call last):
        5: from /bin/git-status-tree:6:in `<main>'
        4: from /src/git_status_tree.rb:22:in `to_s'
        3: from /lib/node.rb:118:in `to_tree_s'
        2: from /lib/nodes_collection.rb:170:in `to_tree_s'
        1: from /lib/node.rb:112:in `to_tree_s'
/lib/node.rb:112:in `+': no implicit conversion of Array into String (TypeError)

Add a workaround. My ruby is extremely terrible but this at least
prevents crashing in this case 😬.

❯ ./bin/git-status-tree
.
├── lib
│   └── node.rb (M+)
└── README.md (??)

I don't know how to add test coverage for this 😞.

[knugie]

Thanks for raising this issue. Which Ruby and git versions did you use? I'll have a closer look tomorrow.

[noahp]

I was using these versions:

❯ git --version
git version 2.30.2

❯ ruby --version
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux-gnu]

Thanks for taking a look!

[knugie]

✅ Fixed 21d5119
✅ Released https://github.com/knugie/git-status-tree/releases/tag/v1.0.1
✅ Published https://rubygems.org/gems/git-status-tree/versions/1.0.1

Thank you very much for contributing @noahp

[noahp]

Thank you for fixing it so quickly! love this utility, been using it daily for years, thanks so much for building it 👍 !