Return http.StatusNotFound error when trying to get a channel by name without permissions (#13443)

store/sqlstore/channel_store.go

@@ -1181,7 +1181,7 @@ func (s SqlChannelStore) getByName(teamId string, name string, includeDeleted bo
 
 	if err := s.GetReplica().SelectOne(&channel, query, map[string]interface{}{"TeamId": teamId, "Name": name}); err != nil {
 		if err == sql.ErrNoRows {
-			return nil, model.NewAppError("SqlChannelStore.GetByName", store.MISSING_CHANNEL_ERROR, nil, "teamId="+teamId+", "+"name="+name+", "+err.Error(), http.StatusNotFound)
+			return nil, model.NewAppError("SqlChannelStore.GetByName", store.MISSING_CHANNEL_ERROR, nil, "teamId="+teamId+", "+"name="+name+"", http.StatusNotFound)
 		}
 		return nil, model.NewAppError("SqlChannelStore.GetByName", "store.sql_channel.get_by_name.existing.app_error", nil, "teamId="+teamId+", "+"name="+name+", "+err.Error(), http.StatusInternalServerError)
 	}