🐛 Bug report | Merging shells crashes FBS

[stevenlabelle]

Description:
Merging 2 shell objects crashes FBS

Version:
Dev Version 3.0.0.1e622434a

Steps To Reproduce:

1. Open FBS and create a 1x1 patch at 0,0,0. Create another 1x1 patch at 1,0,0.
2. Select the patches then click the Merge button.
3. Click ok. FBS will crash