Translate doesn't revert to default locale when passing empty string as locale

[kersysgediminas]

BC Break Report

Q	A
Version	2.27.0

Summary

Passing empty string used to be the same as passing null as locale to \Laminas\I18n\Translator\Translator::translate() but the behavior changed.

@@ -345,7 +345,7 @@ public function getPluginManager()
     */
    public function translate($message, $textDomain = 'default', $locale = null)
    {
-       $locale      = $locale ?: $this->getLocale();
+       $locale      = $locale ?? $this->getLocale();
        $translation = $this->getTranslatedMessage($message, $locale, $textDomain);

https://github.com/laminas/laminas-i18n/pull/117/files#diff-617dd26fad700da3ee06fad2afafa9652a82a157416b914efbada1998c38d478L348

Previous behavior

\Laminas\I18n\Translator\Translator::translate() returns translated message using default locale when empty string is passed as locale

Current behavior

\Laminas\I18n\Translator\Translator::translate() returns untranslated message when empty string is passed as locale.

How to reproduce

pass empty string as locale to \Laminas\I18n\Translator\Translator::translate()

[froschdesign]

@gsteel
Can you take a look at this? Thanks in advance! 👍🏻

[gsteel]

Closed via #136