Support not filling in optional fields (e.g. no Project)

[Patabugen]

The plugin struggles to identify running timers if they don't have all their fields set, even though some of these fiels are optional with Toggl, leading to this workaround:

For correct stopping and polling, please make sure all settings are set: Entry Name, Workspace and Project. Try switching the profiles too, it should reinitialise all buttons.

Originally posted by @tobimori in #22 (comment)