onBlur is not called when year/month mode is activated

### I'm Submitting a ...

```
[X] Bug report
[ ] Feature request
[ ] Support request
```

### Steps to Reproduce
Configure datepicker in year or month mode.

### Expected Results
User selects year/month and the blur event will triggered.

### Actual Results
Blur event isn't triggerd at all when in mode month/year.

Start by reproducing the issue with the datepicker configured in year mode and then month mode, tracing the existing blur handling around year/month selection. Done means selecting either a year or month triggers the blur event as expected, while the existing datepicker behavior remains intact.

Written by the indexing model from the issue text.