Prevent accidental removal of user from town square (#4842)

model/client.go

@@ -1258,7 +1258,7 @@ func (c *Client) GetChannelByName(channelName string) (*Result, *AppError) {
 	} else {
 		defer closeBody(r)
 		return &Result{r.Header.Get(HEADER_REQUEST_ID),
-			r.Header.Get(HEADER_ETAG_SERVER), ChannelMemberFromJson(r.Body)}, nil
+			r.Header.Get(HEADER_ETAG_SERVER), ChannelFromJson(r.Body)}, nil
 	}
 }