reinstate csv column array building even on empty values

Author: CGastrell

projects/packages/forms/src/contact-form/class-contact-form-plugin.php

@@ -3428,6 +3428,8 @@ public function export_to_gdrive() {
 			foreach ( $fields as $single_field_name ) {
 				if ( isset( $export_data[ $single_field_name ][ $i ] ) ) {
 					$current_row[] = $export_data[ $single_field_name ][ $i ];
+				} else {
+					$current_row[] = '';
 				}
 			}