CT: Model multiple containers error

[Stryzhevska]

Describe the bug

CT: Model works fine with a single Containers and generates an error if multiple Containers are given as input simultaneously

To Reproduce

Steps to reproduce the behavior:

1. Plug more than one Containers (CT: Wall or CT: Slab) inputs
2. Get errors - see screenshot

Expected behavior

A single CT: Model component can take multiple Containers as input

Screenshots

[chenkasirer]

@chenkasirer will look at this with @Stryzhevska