Please cherry-pick:

Please cherry-pick:
- renamed business_data -> business_basic_data
- renamed CONTACT_BUSINESS -> BUSINESS_BASIC_DATA and prevented double _DATA
- need to check on value, not converted email address: if e.g. an empty email
  address is submitted, JSF seem to handle it as NULL, not empty, which makes
  sense here at the converter, as 'value' is of type Object and not String

Signed-off-by: Roland Häder <roland@mxchange.org>