listTorrents doesn't respect empty strings as valid inputs for category and tag

[fr3fou]

https://github.com/qbittorrent/qBittorrent/wiki/WebUI-API-(qBittorrent-4.1)#get-torrent-list

Both the tag and category fields can accept an empty string, which the current implementation completely ignores:

qbittorrent/src/qbittorrent.ts

Lines 172 to 178 in 593035a

	if (category) {
	params.category = category;
	}
	if (tag) {
	params.tag = tag;
	}

[scttcper]

🎉 This issue has been resolved in version 5.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[scttcper]

Thanks for reporting, just as a heads up, this client does not seem to work well with the recently released version of qbittorrent 4.5