Hide Silo Filltype

This script hides fill types with a quantity of 0 when unloading a silo into a trailer or device. All fill types can still be stored in the silo, but only those with a quantity greater than 0 will be displayed during unloading. This functionality depends on the trailer or device being used. To utilize this feature, there must be at least one fill type present in the silo.

Changelog:
- Fixed a script error