Update Step.php

[mlespiau]

Prevent division by zero when using acceptPopup and closePopup in Acceptance tests.

Related to Codeception#3922

[edno]

You're patch will prevent the division by zero, but it will hide the problem rather really fixing it.

Since there no need to reach this part of the function when there's no arguments, I would suggest to save time by quitting the function if $argumentCount equals 0 after line 94.

if ($argumentCount == 0) {
    return '';
}