Oh, of course! That is intended behavior. So you would rather not have to tap "Save" each time you add an empty flashcard? Since you will need a dictionary to translate them anyway at some point, I would try getting the Grand Ricci and/or the Hanyu Da Cidian to fill in the flashcards right from the start. Both of these dictionaries know over 300,000 expressions. Otherwise, the pinyin transcriptions for the unknown flashcards may also be wrong, because Pleco just puts them together character by character.