CTD when assigning categories to batch of mods via multi-select while still in filter view

[LordOfLA]

The problem:

MO2 will freeze and eventually CTD (or just straight up CTD) when assigning categories to multiple mods via multi-select when applying a filter such as "No Category".

To Reproduce:

Steps to reproduce the behaviour:

1. Install a bunch of mods. I've had it CTD on as little as 18 or as many as 106 in one go.
2. Expand filter list and select "No Category"
3. Select all installed mods with no category assigned.
4. Right-click > Change categories > Select a category
5. Watch as MO2 implodes on itself. May or may not create a crash dump in process.

Environment:

• Mod Organizer Version that exhibits the issue: MO2.2.1-alpha-Silarn-build2
• Last Mod Organizer Verison that did not exhibit the issue (if applicable): N/A
• Desktop OS/version used to run Mod Organizer: Windows 10 1903 (18362.113)

Link to Mod Organizer logs:

https://mega.nz/#!fZYDEYJS!3rmnP_VWcUpfsShEDrrrNE9VB943tTRMMSxCwPixmXQ