Import fails if underscore or space included in .json filename

[seascape]

Bug Report

Please fill out this information:

• Browser version: Firefox 73.0.1
• Extension version: 1.2.7
• Operating system: Win10 x64

---

What happened?
A site changed its URL scheme so I had to export my notes and change a bunch of URLs via a regular expression. When I tried to re-import them Note Taker lost all notes and settings. The cause turned out to be introducing space and/or underscore characters in my fixed .json filename, so the workaround was thankfully trivial.

I would not be surprised if other ostensibly legal characters in the filename can cause this too.

---

How to reproduce:
Export notes. Add a space or underscore to the .json filename. Try to import the .json. Notes and settings should be lost.

---

When this occurs the browser console outputs the top two lines here: