FIX: findEvent without title breaks the search-string

window.plugins.calendar.findEvent(null,null,"Test",startDate,endDate,success,error) ends in a broken search term: " AND notes == 'Test'" and not  "notes == 'Test'"
Merge pull request #107 from signalwerk/patch-find

FIX: findEvent without title breaks the search-string, thanks @signalwerk!