Oni should warn about missing neovim

[daveriedstra]

Oni Version: 0.3.6-5887 Neovim Version (Linux only): whoops, forgot to install Operating System: Ubuntu 18.04

Issue: When starting for the first time, an error occurs: Error: ENOENT: no such file or directory, open '/home/username/.config/oni/Settings'. After closing out the error window, the application closes. I realised that I forgot to install neovim, did so, and the app now opens fine, but maybe missing neovim should be evident from the error message.

Expected behavior: Application opens and warns about neovim absence.

Actual behavior: Error with no info relating to neovim, application closes.

Steps to reproduce: Install oni via .deb, neglect to install neovim, open oni.

Thanks for the cool project, can't wait to try it!

[oni-bot[bot]]

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