Clearing date fields manually after dates where entered may cause date to be set to +00000000000-00-00T00:00:00Z

[Former user]

Following happened:

1. Clicked same link in text two times. Born and death dates where set to same.
2. Clicked borned button and removed dates by clicking in fields and pressed backspace in all fields.
3. Clicked save settings.
4. Clicked Accept in order to set the death date.

The edit added +00000000000-00-00T00:00:00Z as born date.

[Andre Engels]

Duplicate of issue #62

[Waldir Pimenta]

Duplicate of #62.