Unable to export/save HTML in mac version 2.12

[jbickelhaupt]

Describe the bug
Cannot export MJML-generated HTML to save as an HTML file on my local machine using the desktop app, mac version 2.12. If I revert to 2.11, I have no issues. Have looked to see if it saves files to a default location elsewhere, but still cannot find HTML versions of any email projects I try to export.

To Reproduce
Steps to reproduce the behavior:

1. Open desktop app and create/open an email project
2. Click on 'Export to HTML file' button
3. Button click is registered visually, but nothing else happens (this being the error)

Expected behavior
After clicking on the export to HTML button, I expected to choose a location on my local machine to save my MJML-generated HTML (as I've successfully done using app version 2.11). Instead, it just shows a button click and no ability to save or export an HTML file.

Environment (please complete the following information):

• Platform: 2019 MacBook Pro
• OS: macOS Mojave (version 10.14.6)
• App Version 2.12

Additional context
I was creating a new email and then went to export the HTML and couldn't select a file location or find it saved anywhere by default on my machine. I finally opened the online editor to drop in my MJML so that I could convert it. Grabbed the code and then saved it as HTML in a local code editor.

I have since reverted to app version 2.11, allowing me to export/save HTML files as intended.

[jbickelhaupt]

This seems to be related to the "Warn for relative paths on HTML export" option in the settings. If checked, you cannot export the HTML file. Unchecked, it works as expected.