fix incorrect instructions to "maintenance" menu

(on finding an empty card, tells user to go to old location of the empty
cards tool)
Merge pull request #36 from sobjornstad/master

Fix incorrect maintenance text
Handle invalid import file argument in both launch cases (single-profile and multi-profile launch) (#924)
Merge pull request #37 from hans/patch/924

Handle invalid import file argument in both launch cases (single-profile...
don't send old backups to the trash (#912)
fall back on regular delete on broken recycle bin (#926)
fix graph regression caused by div changes (#913)
keep scanning csv until we find non-zero field count (#920)
don't bug out if cloze:text is invalid (#925)
allow urllib2 to be passed unicode data to send (#923)
Merge remote-tracking branch 'dae/master' into feature-flake

Conflicts:
	aqt/main.py
	aqt/models.py
Merge branch 'feature-flake' into develop-flake