dom_str_replace should accept empty replacements

<?php
if ($option_name !== 'replace' && empty($this->configuration[$option_name])) {
?>

seems to do the trick.

I ran into this today, while trying to fix a bunch of alt attribute values that people left with meaningless placeholder values (and they should really be empty anyway).

This worked, on line 95 -- h/t @danflanagan8 on Slack:

if (!(array_key_exists($option_name, $this->configuration))) {

But I can also see the merit of @koosvdkolk's suggestion in #2, because (again, h/t @danflanagan8 on Slack), maybe no other options should be allowed to be empty?

Probably we need maintainer input on this!

I was also trying to do a replace with empty today, and noticed the problem.

But I can also see the merit of @koosvdkolk's suggestion in #2, because (again, h/t @danflanagan8 on Slack), maybe no other options should be allowed to be empty?

Exactly, in all other cases options needs a value, so allowing empty of them may not make sense.

I ended up with a variation of the same idea in the code above.

I opened related MR !89 about it, with one commit.

- 804f2e2 Allow replacing with an empty string on dom_str_replace migrate process plugin

Marking as NR.