Bad experience when refresh token expires

[wbazant]

The mechanism to renew a token does not always work. When it's a while since I opened the app, the refresh tries to happen (url like https://fallingfruit.org/api/0.3/user/token/refresh?api_key=AKDJGHSD ) and fails:
401 with "Invalid refresh token"

I thought it's a fallout of #617 , but as Ethan says below, likely to be a normal (although rare) case. I had this happen to me in the add location form - the call failed, and didn't get handled well: I didn't get logged out, and the submit button was stuck in 'Submitting' state, which I had no way to reset.

[ezwelty]

@wbazant It seems normal that token refresh would fail, since eventually the refresh token expires (or is revoked server-side). Are you not then redirected to the sign in page?