CRM-13490 : the concept used for fixing this is - detach the 'required' form rule for address custom data field, check if the address is filled i.e. intended to be submitted if 'yes' then check for 'required' custom field form rule

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* CRM-13490: Addresses with required custom fields can't be deleted from the Edit screen
  http://issues.civicrm.org/jira/browse/CRM-13490
CRM-13490 : re-framed the logic, used proper error setting methods

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* CRM-13490: Addresses with required custom fields can't be deleted from the Edit screen
  http://issues.civicrm.org/jira/browse/CRM-13490
Merge pull request #1820 from pratik-joshi/CRM-13490

Crm 13490