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Description of problem:
When adding a new entry to GnomeCard the Birthdate field will default to
12/31/1969 if you attempt to replace the field with null. Would it be possible
to have this field accept a null value (as the other fields do) for the case in
which a birthdate is not known?

Version-Release number of selected component (if applicable): 
GnomeCard 1.2.0


How reproducible:
Always

Steps to Reproduce:
1. Open GnomeCard and click the add button.
2. Fill out some user info and erase the date in the Birthdate field
3. Press apply, OK, then close out GnomeCard saying yes to save prompt.
4. Open GnomeCard back up and note that the birthdate field has been defaulted
to 12/31/1969 for the entry just added.
	

Actual Results:  Birthdate field changed to 12/31/1969

Expected Results:  Birthdate field should be allowed to be null.

Additional info: