@jelbourn ready for you to take a look

Should be ready for another look.

I updated MdDatepickerContent to use the safe navigation operator. This is necessary as the newly created ComponentPortal<MdDatepicker> instance is immediately change detected. We need to guard against undefined and null since the inputs aren't guaranteed to be populated.

cc:@mmalerba as this is modifying the newly created MdDatepicker

LGTM for datepicker

@jelbourn @mmalerba @josephperrott the CD changes made here are causing several regressions with the datepicker in popup view

1. Unable to start in year view
2. Start at date has no effect
3. "Prev month" button initially enabled when min date in current month
4. When setting min/max dates within current month, all days are enabled until month view is refreshed
5. Active date is not highlighted until month view is refreshed

ref #5065

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