CRM-13714 - Display fatal error for Joomla 3.x

http://issues.civicrm.org/jira/browse/CRM-13714
CRM-13715 - fix bug when included in report columns

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* CRM-13715: Add custom field column to Contribution Details report crashes
  http://issues.civicrm.org/jira/browse/CRM-13715
Merge pull request #1944 from dlobo/CRM-13715

CRM-13715 - fix bug when included in report columns
Merge pull request #1943 from dlobo/CRM-13714

CRM-13714 - Display fatal error for Joomla 3.x