CRM-13807 - Verify BAO exists in api getBAO
Merge pull request #2063 from colemanw/4.4

CRM-13807 - Verify BAO exists in api getBAO
CRM-13807 - Fix last to commit to getBAO and add unit test
Merge pull request #2064 from colemanw/4.4

CRM-13807 - Fix last to commit to getBAO and add unit test
CRM-13807 - Add comments and null test
Update version to 4.4.3