Taxonomy is not saving after updating to 3.1.16

Hello,

Thank you for this awesome plugin.

After updating to version 3.1.16 from 3.1.15. I found out that posts created through the form are missing the taxonomy.

I made a comparison between the old and the new version of plugin to find the differences.

Version 3.1.15 > gfcptaddon_1-5.php line 43-51

        function get_field_taxonomy( $field ) {
          if (array_key_exists('populateTaxonomy', $field)) {
            return $field['populateTaxonomy'];
          } else if (array_key_exists('saveToTaxonomy', $field)) {
            return $field['saveToTaxonomy'];
          } else {
            return false;
          }
        }

Version 3.1.16 > gfcptaddon_1-5.php line 43-51

        function get_field_taxonomy( $field ) {
            if ( isset( $field->populateTaxonomy ) ) {
                return $field->populateTaxonomy;
            } elseif ( isset( $field->populateTaxonomy ) ) {
                return $field->populateTaxonomy;
            }
            return false;
        }

I changed the code in 3.1.16 to the following and it is working fine for me.

	    function get_field_taxonomy( $field ) {
		    if ( isset( $field->populateTaxonomy ) ) {
			    return $field->populateTaxonomy;
		    } elseif ( isset( $field->saveToTaxonomy ) ) {
			    return $field->saveToTaxonomy;
		    }

		    return false;
	    }