AMS spool shows in container app when no spool is loaded

[synman]

For example, if you only have AMS slots 1, 2, and 4 loaded, the Bambu Printer Manager container app still shows the 3rd slot, albeit generally empty.

[synman]

I'm thinking the best way to mitigate this is to create a "No Filament Selected" entry in the filaments list. This feels better than removing the entry entirely and has implications for non RFID loaded spools.