* Refactor of getListOfAllowedChannelsForTeam
Also, I've fixed some problematic scenarios:
- The quick search doesn't provide team id so it was always failing
- When the teamId was empty and view restrictions too we always
return all the channels because if we do "strings.Contains("foo", "")
it always returns true
- There was a case, in quick search with a guest account, where you
get an empty result because teamId is not provided
* Error if team id is not passed when searching for the channel
If we search users passing the channel id, we must pass the team id
too so we avoid returning all the channels if we remove the empty
team id restriction we have in the getListOfAllowedChannelsForTeam
There is no known reason to search for a channel but not filtering
using the team id. Even guest accounts belong to a team
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