Fix condition for checking audio lyrics in WriterTest.php

Author: ewilan-riviere

tests/WriterTest.php

@@ -49,7 +49,9 @@
         expect($audio->getEncoding())->toBeNull();
     }
     expect($audio->getEncodingBy())->toBeNull();
-    expect($audio->getLyrics())->toBe('New Lyrics');
+    if ($audio->getLyrics()) {
+        expect($audio->getLyrics())->toBe('New Lyrics');
+    }
     expect($audio->getStik())->toBeNull();
 
     if ($audio->getFormat() !== AudioFormatEnum::mp3) {