Incorrect logic in RulesDataUI::renderOptionsLabel()

The function renderOptionsLabel() contains bad logic. In the following conditional, the "else" can be executed when $value is not an array (i.e. when isset($options[$value]) returns FALSE), resulting in PHP warnings.

The code at fault (found in ui/ui.data.inc line 98):

      if (!is_array($value) && isset($options[$value])) {
        $value = $options[$value];
      }
      else {
        foreach ($value as $key => $single_value) {
          if (isset($options[$single_value])) {
            $value[$key] = $options[$single_value];
          }
        }
        $value = implode(', ', $value);
      }

If a non-array $value gets into the "else" statement, you get errors:

# Warning: Invalid argument supplied for foreach() in RulesDataUI::renderOptionsLabel() (line 102 of /xxx/sites/all/modules/rules/ui/ui.data.inc).
# Warning: implode() [function.implode]: Invalid arguments passed in RulesDataUI::renderOptionsLabel() (line 107 of /xxx/sites/all/modules/rules/ui/ui.data.inc).