UpdateAddress.php considers a 'null' geocode succesful

At line #152 of CRM/Utils/Geocode/Google.php we see:

// reset the geo code values if we did not get any good values
$values['geo_code_1'] = $values['geo_code_2'] = 'null';
return false;

which line #209 of bin/UpdateAddress.php considers successful:

if ( isset( $params['geo_code_1'] ) ) {
$totalGeocoded++;

Patch simply adds check for 'null' as return value.

This issue may be addressed as part of CRM-7699