Removing some clutter

[melyux]

There are some mostly implicit/useless values that will help remove clutter (as by example from the older Transmission Remote GUI project):

• Show blank instead of "Unknown" for ETA
• Show blank instead of "never" for last active
• Show blank instead of -1 for ratio of magnetized torrents

[qu1ck]

Disagree on the first, having no eta is different from unknown eta and should be reflected.

Others are fixed.

[melyux]

Some of my seeding transfers have a blank ETA while others have "Unknown", and inactive downloads have blank too. It's all over the place. What does Unknown indicate?

Just a lot going on with no really useful informational difference between blank and Unknown afaict:

[qu1ck]

"Unknown" means ETA field is applicable, but can not be calculated. For example if you have a seeding limit but upload speed is 0 or downloading and download speed is 0. Empty means ETA is not applicable, i.e. torrent will be in current state indefinitely. Transmission api returns distinct values for these.

[melyux]

Makes sense for the most part. Maybe instead of "Unknown" it could be a "-" to be less distracting? It's just hard to pick out the useful ETA numbers from endless "Unknown"s at a glance

[qu1ck]

And then I will get questions about what "-" means. Use sorting and filters to present the data as you want it.

[Pentaphon]

• Show blank instead of "Unknown" for ETA

How about the infinity symbol? qBittorrent and uTorrent already do that.

[qu1ck]

I like that, actually use it in few other places already.

[qu1ck]

Implemented in v0.7.0