Standardized "empty" messages

- My active trades & my history “empty” messages now use the same form
error(red) style, not an error per se, but shows that it’s an
empty/negative result.
- Excluded closed lots from the allLots query on my history page.
Since closed lots don’t visually display they were keeping the “you
don’t have any completed trades” message from displaying because the
allLots result wasn’t empty.