Files Added With Intent To Stage Disappear From File Status Widget

Untracked files appear in the File status in the Unstaged files widget. When staging an untracked file (git add -N <filename>), the file disappears from both the Unstaged files and Staged files widgets.

Steps to Reproduce

1. Create a new repository and open it in the SourceTree client
2. From the command line, change directory to the repo and create a new file with some content in it
3. Confirm the file is showing in SourceTree by clicking on File status and pressing ⌘+R
4. Add the file with an intent to stage later by running git add -N <filename>
5. Refresh the SourceTree window by pressing ⌘+R

Expected Results

The file should be showing in the Staged files widget as a new file with no content. The file should also be showing in the Unstaged files as a modified file with all content counting as a diff from the staged version of the file with zero content.

Actual Results

The file does not show up in either widget.