The ezgeneratetranslationcache.php script won't generate any caches when the ts-list command line option is not provided.

$translations = split( ' ', $scriptOptions['ts-list'] );

If the ts-list option is not provided, $scriptOptions['ts-list'] will be null in the code above and $translations will become an array with one item: an empty string. But eZTSTranslator::fetchList checks the count of the passed array.

I propose to replace the code above with this:

if ( isset( $scriptOptions['ts-list'] ) )
{
    $translations = split( ' ', $scriptOptions['ts-list'] );
}
else
{
    $translations = array();
}