Warnings in relationship report when running in PHP developer mode.

When running under IIS in PHP developer mode, running a relationship report gave the following warnings.
PHP Warning: Invalid argument supplied for foreach() in D:\CiviCRM_Custom.git\Custom\Code\CRM\Report\Form\Contact\Relationship.php on line 582

PHP Warning: strlen() expects parameter 1 to be string, array given in D:\CiviCRM_Custom.git\joomla\administrator\components\com_civicrm\civicrm\CRM\Report\Form.php on line 1894

The first was caused by the parameter not being an array, and the second because it was. II introduced logic to check for the two conditions and attach patch files against their 4.7.3 versions.