CRM-13768 - api_v3_CaseTest::testCreateCaseEmpty - Fix regression and warning

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* CRM-13768: CiviCase not fully activated during extension installation
  http://issues.civicrm.org/jira/browse/CRM-13768
Merge pull request #2043 from totten/4.4-case-test

CRM-13768 - api_v3_CaseTest::testCreateCaseEmpty - Fix regression and warning