Fix: Do not pass null to function that expects string

[localheinz]

This pull request

• stops passing null to a function that expects string

Spotted in #900.

💁‍♂️ In the first iteration of the inner foreach-loop, $version is null:

web-php/include/version.inc

Lines 85 to 89 in e1c6168

	$version = null;
	$current = null;
	foreach ($RELEASES as $versions) {
	foreach ($versions as $ver => $info) {
	if (version_compare($ver, $version) > 0) {

[github-actions]

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[saundefined]

Thanks!

[localheinz]

Thank you, @saundefined!