Occasional "no document found" error

[zplizzi]

Occasionally, when I save a file that I'm editing, the web server will return "no document found.." instead of rendering the file.

It happens maybe 1 in 20 times I save the file, and just saving the file again will usually result in a proper render.

I'm editing in vim, and started the server with mdstart myfile.md. On mac with version 1.4.1.

Overall not a big issue, not even something that needs fixed, just something I noticed.