Vocup shouldn't accept an empty entry

[jdelange22]

Like the title says. I noticed that pressing just enter or clicking 'continue' treats the input as wrongly practiced. I believe it should ignore the empty input and not continue to the next word. Perhaps a warning message to be shown like "input required".

[daniel-lerch]

I believe this is intentional. Just like in a vocabulary test at school, giving no answer is equal to a completely wrong answer. We could give user an option here to configure whether no input should be PracticeResult.WronglyPracticed (default) or PracticeResult.NotPracticed (skipped).

[jdelange22]

True, but on a computer it is likely to make a mistake, pressing enter accidentally instead of shift for example. I like the idea of adding an option. We also have another issue that involves expanding the options (#60).