src/Services/ApplicationService.php
public function hasRequiredValue($postVars, $keys)
    {
        foreach ($keys as $key) {
            $requiredKey = $this->findKey($key, $postVars);
            if (array_key_exists($requiredKey, $postVars) && $postVars[$requiredKey] !== '') return true;
        }

        return false;
    }
public function hasRequiredValue($postVars, $keys)
    {
        foreach ($keys as $key) {
            $requiredKey = $this->findKey($key, $postVars);
            if (array_key_exists($requiredKey, $postVars) && $postVars[$requiredKey] !== '') return true;
        }

        return false;
    }
Since a required field can have multiple possible inputs, this method just checks the
field has a value and returns true if it does.  If it finds no values in any of the inputs
it returns false.

@params  Array   $postVars   Greenhouse post parameters.
@params  Array   $keys       The keys to check for in $postVars
@return  boolean