Check that Kolibri does not fail to start when deleting the home folder contents

Observed behavior

During the testing of Kolibri mac installer I found this issue when deleting the home folder contents will cause an error and kolibri can’t start the server. here’s the issue I reported on mac installer repo

@kollivier has a comment about this issue here https://github.com/learningequality/kolibri-installer-mac/issues/51#issuecomment-582021971:

It turns out that the issue is that when you delete the contents of ~/.kolibri from Finder, it leaves the hidden .data_version file, and Kolibri uses that file to determine when it needs to run migrations

Expected behavior

If Kolibri finds a .data_version file but no database, perhaps it should clear the file?

User-facing consequences

In some situations, user might think they have reset Kolibri but get into a stuck state. I believe if they delete the entire .kolibri folder this would not happen.

Errors and logs

kolibri.txt kolibri-app.txt

Steps to reproduce

Delete all non-hidden files from ~/.kolibri

Context

Tell us about your environment, including:

• Kolibri version: 0.13
• Operating system: macOS 10.14.6
• Browser

[jonboiser]

@jonboiser Does this need a proper Gherkin scenario, or the user story above is just a suggestion for a possible fix to implement?

It’s a user story to confirm that this bug still exists or not (Richard seems to have gone through the story himself and found the bug doesn’t exist anymore).

We can just add it to the list of Gherkins, esp. with the proper variations for Windows.

[rtibbles]

Have just posted in #7952 - I was unable to replicate that issue either.