Fix error when trying to open diff view from split view on (Un)staged changes line #836
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The problem occurs when you have staged or unstaged changes in the repository and is mostly visible when diff-highlight is true. If you press d or enter in the main view it will automatically switch to stage view while if you press d from the split view it opens diff view and you get an annoying "Failed run the diff-highlight program: diff-highlight". For consistency, switch to stage view as it is done for the main view when there is no commit associated to the selected line.