Check whether sticker pack exists on signalstickers.com before submitting

[rugk]

currently

The current process is as follows:

1. you send a sticker
2. Bot converts it.
3. You press to submit it to signalstickers.com
4. You fill out all the details including tags
5. You press submit

When the sticker pack already exists on signalstickers.com you only get the error at the end then. I.e. after having all the trouble with filling out all the details.

wanted

What I'd want is the following:

1. you send a sticker
2. Bot converts it.
3. You press to submit it to signalstickers.com
4. Not now checks whether the pack already exists on signalstickers.com and if so, cancels the process showing you an error already now, that this won't work.

This would save a lot of work.