CRM-12853 related fix, Pseudoconstant filter issue for Drupal Views3

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* CRM-12853: Patch for CiviCase + Drupal Views3 integration
  http://issues.civicrm.org/jira/browse/CRM-12853
Merge pull request #46 from monishdeb/CRM-12853

CRM-12853 related fix, Pseudoconstant filter issue for Drupal Views3