Bug with visualize before in thermal simulation

[JonasHoelscher]

Describe the bug
When running a thermal simulation with the option visualize_before=True and the previous executed electro_magnetic simulation had the option show_results=True the thermal model will be filled with the electro_magnetic results.

To Reproduce

1. set visualize_before=True in thermal simulation
2. set show_results=True in electro magnetic simulation
3. run electro magnetic and then thermal simulation

Expected behavior
The thermal model should be drawn without the elctro magnetic results.

Screenshots