Typo suggestion prints "Did you mean ''?" when no command is close

[pranav-dp]

hey.. found a small bug when i was trying out the CLI..

when u type a command thats close to a real keyword, it gives a good suggestion like :

  $ context-dev brnd
  No help topic for 'brnd'. Did you mean 'context-dev brand'?

but when the command is not close to anything, the suggestion comes out empty:

  $ context-dev qqqq
  No help topic for 'qqqq'. Did you mean ''?

so it shows "Did you mean ''?" with nothing inside the quotes.

i think the cause is in pkg/cmd/suggest.go: suggestCommand always returns a
"Did you mean '...'?" string, even when it didnt find a close match. the
original urfave/cli version returns an empty string in that case, and the
caller only prints a suggestion when its not empty - so here the empty one
slips through.

happy to send a small PR for this if its useful - basically return an empty
string when nothing's close, so it just stays quiet. real typos like 'brnd'
would keep working.

side thought (separate from the bug, feel free to ignore): when nothing is
close, instead of showing nothing, maybe it could nudge people toward the
command list? something like:

  No help topic for 'qqqq'. Run 'context-dev --help' to see available commands.

or if a couple of commands are actually similar, just list those few. not sure
if that fits the direction u want - happy to help either way