qmicli,uim: skip warning about missing TLVs in slot status
If an optional TLV is missing, we just skip printing its contents, we don't need to write any message saying the TLV is missing.
# qmicli -d /dev/cdc-wdm0 -p --uim-get-slot-status
[/dev/cdc-wdm0] Successfully got slots status
Slot EID information is unavailable: Field 'Slot EID Information' was not found in the message
[/dev/cdc-wdm0] 2 physical slots found:
Physical slot 1:
Card status: present
Slot status: active
Logical slot: 1
...