CRM-14983 - Sunning Contribution via Search Builder Fails Putting Contacts in Smart Group

https://issues.civicrm.org/jira/browse/CRM-14983
Empty check for datetime field
Webtest for CRM-14952

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* CRM-14952: Sorting on state in search throws FATAL error: Database Error Code: Unknown column 'civicrm_state_province.name' in 'field list'
  https://issues.civicrm.org/jira/browse/CRM-14952
Merge pull request #3708 from atif-shaikh/CRM-14983

CRM-14983 - Sunning Contribution via Search Builder Fails Putting Contac...
Merge pull request #3728 from atif-shaikh/CRM-14952-webtest-fix

Webtest for CRM-14952
Merge pull request #3726 from jitendrapurohit/CRM-14983

Empty check for datetime field
CRM-15031 - Partial fixes for Event related webtests.

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* CRM-15031:
  https://issues.civicrm.org/jira/browse/CRM-15031
Merge pull request #3731 from davecivicrm/CRM-15031

CRM-15031 - Partial fixes for Event related webtests.