Catch ActivityNotFoundException (file-manager) and display a meaningful error

[litetex]

Checklist

• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one feature request. I will open one issue for every feature I want to request.

Describe the feature you want

There are currently many issues that say that an file-manager - that should be shipped by a "standard" android - is missing:
https://github.com/TeamNewPipe/NewPipe/search?o=desc&q=No+Activity+found+to+handle+Intent&s=created&type=issues

This is usually due to incomplete custom ROMs or because the user uninstalled it's file-manager.

Background: It reached my tipping-point when I got 2 new comment-notifications in #7076 within 12h as some people seem too be unable to read properly what I wrote a few comments above or search for the error.

Also sometimes the ACRA report seems to fail: #7076 (comment)

Anyway the missing file-manager usually results in a ActivityNotFoundException, e.g:

• android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.OPEN_DOCUMENT cat=[android.intent.category.OPENABLE] typ=*/* flg=0x43 (has extras) }
• android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.CREATE_DOCUMENT cat=[android.intent.category.OPENABLE] typ=application/zip flg=0x43 (has extras) }

It would be great if we could catch exceptions like those and show a dialog/toast that says something like "Unable to open file-manager... Is one installed?".
A simple try catch on certain code blocks should be enough 😄

Is your feature request related to a problem? Please describe it

https://github.com/TeamNewPipe/NewPipe/search?o=desc&q=No+Activity+found+to+handle+Intent&s=created&type=issues

How will you/everyone benefit from this feature?

Devs/Mods: Less issues that can have to investigated and closed as duplicates
Users: Faster knowledge of what causes the error → can fix it themselves