Make a lack of ALTQ-capable interfaces more obvious to the user
On systems that do not have any assigned interfaces capable of using ALTQ, that fact is not make obvious enough to the user. Some screens are simply blank or produce ambiguous error messages.
This is especially a problem on SG-1000 since the cpsw interfaces do not yet support ALTQ.
Be more forthcoming with errors about ALTQ interfaces in relevant areas of the GUI. In particular, note when there are no capable interfaces assigned. Implements #7032
- Status changed from Assigned to Feedback
- % Done changed from 0 to 100
- Status changed from Feedback to Resolved
Looks much more obvious, hopefully it's clear to users now.
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