The channel form has three inputs all named 'name' (one per kind
section: webhook / ntfy / smtp), but only the visible kind's input
is filled in. PostForm.Get returns the first regardless of
emptiness, so editing an ntfy or smtp channel always read '' from
the (hidden, unfilled) webhook section's name input and rejected
with 'name required'.
Add firstNonEmpty helper that scans the slice for the first
non-blank value. Same flavour of bug as the enabled checkbox fix
in 24eecc1 — both fall out of having multiple inputs share a name
across the per-kind sub-forms.
steve
373d74cdaf