Item10267: I18N.pm: Use of uninitialized value in lc

In Apache's error_log there are many lines as

> Use of uninitialized value $tag in lc at /var/www/foswiki/lib/Foswiki/I18N.pm line 51.

They occur on navigating to almost any Wiki page until the user switches language in TopBar's drop down box once.

Another way to prevent it seems to be to define a language in user's preferences like

• Set LANGUAGE = de

But then the errors are listed at least until the user logs in.

tools/mailnotify gets the errors as well.

I tested two possible fixes in I18N.pm:

1) My own one:

    sub _normalize_language_tag {
        my $tag = shift;
        if ( not $tag ) { return '' }  # fix
        $tag = lc($tag);

2) Or according to http://foswiki.org/Tasks/Item9151 (Item9151: use of uninitialised value in lc())

    sub _normalize_language_tag {
        my $tag = shift;
        $tag = lc($tag || '' );      # fix

Now it's much more quiet in error_log.

-- ChristianZiemski - 18 Jan 2011

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