Bug involving statements that have a duration 0S

There is a problem with the following line of code in the function _opigno_tincan_api_set_result line 166:
// Remove all the 0 in the formatted duration

$duration_string = preg_replace('/0\D/i', '', $duration_string);

This does not take into account if the duration ends in 10S ,20S ,30S ,40S ,50S seconds and in that case it removes the 0S and leaves number without a character to give it a meaning which results in failed statement.
Examples:

//removes the 0M correctly but also the 0S
Example input: DT0M10S
Example output: DT1
Expected output DT10S

Example input: DT5M10S
Example output: DT5M1
Expected output DT5M10S

Somewhat better solution(still not perfect):

$duration_string = preg_replace('/(\D)0\D/', '${1}', $duration_string);