Undefined index: path in load_script_textdomain function

[tmatsuur]

I will report an error message when using the wp_set_scrianslations function in the development environment.

Notice:  Undefined index: path in <b>.../htdocs/wp-includes/l10n.php on line 928

This error occurrence point is as follows.

	( strpos( $site_url['path'], $src_url['path'] ) === 0 ) &&

This is because the 'path' key does not exist in variable $site_url if site_url is 'http: localhost'.

I think it is necessary to determine whether the 'path' key exists in the variable $site_url before the strpos function.

[georgestephanis]

https://core.trac.wordpress.org/attachment/ticket/45103/45103.11.diff resolved this for me in my testing just now.

[herregroen]

In 43898:

I18N: Fix warnings in JavaScript translations.

Fixes an undefined index PHP warning in the load_script_textdomain function and a non-interrupting JS error when registering a domain which has no translations.

Props omarreiss, ocean90, georgestephanis.
Fixes #45256.

[herregroen]

Sign off for the patch was given here:
https://core.trac.wordpress.org/ticket/45103#comment:32

[swissspidy]

Seems to still be an issue: ​https://github.com/WordPress/gutenberg/issues/12670

[pento]

In 44169:

I18N: Add JavaScript translation support.

Adds the wp_set_script_translations() function which registers translations for a JavaScript file. This function takes a handle, domain and optionally a path and ensures JavaScript translation files are loaded if they exist.

Merges [43825,43828,43859,43898] from the 5.0 branch to trunk.

Props herregroen, atimmer, omarreiss, nerrad, swissspidy, ocean90, georgestephanis.
Fixes #45103, #45256.