LocaleUtils: don't NPE if no default locale mapping exists (#1239)

connector/src/main/java/org/geysermc/connector/utils/LocaleUtils.java

@@ -246,6 +246,11 @@ public class LocaleUtils {
         Map<String, String> localeStrings = LocaleUtils.LOCALE_MAPPINGS.get(locale.toLowerCase());
         if (localeStrings == null)
             localeStrings = LocaleUtils.LOCALE_MAPPINGS.get(LanguageUtils.getDefaultLocale());
+        if (localeStrings == null) {
+            // Don't cause a NPE if the locale is STILL missing
+            GeyserConnector.getInstance().getLogger().debug("MISSING DEFAULT LOCALE: " + LanguageUtils.getDefaultLocale());
+            return messageText;
+        }
 
         return localeStrings.getOrDefault(messageText, messageText);
     }