[BUG] Filter by function in REPO tab makes the application crash.

[nirwanah]

Describe the bug
In the REPO tab using the Filter by function before loading in RPKG's will crash the application

To Reproduce
Steps to reproduce the behavior:

1. Start the program.
   (Optional: load in RPKG)
2. Go to REPO.
3. Type somthing in the Filter by box.
4. Application will crash.

RPKG tool version: [e.g. 2.14]
V2.23.0

[Notexe]

I can also confirm that this happens if the "Visual editor" button is pressed before REPO is loaded. It will be fixed in the next update.