Get example previewing voices even if one can't be gotten.

examples/hello_world.rs

@@ -79,15 +79,13 @@ fn main() -> Result<(), Error> {
             println!("{:?}", v);
         }
         let Features { get_voice, .. } = tts.supported_features();
-        if get_voice {
-            let original_voice = tts.voice()?;
-            if let Some(original_voice) = original_voice {
-                for v in &voices {
-                    tts.set_voice(v)?;
-                    tts.speak(format!("This is {}.", v.name()), false)?;
-                }
-                tts.set_voice(&original_voice)?;
-            }
+        let original_voice = if get_voice { tts.voice()? } else { None };
+        for v in &voices {
+            tts.set_voice(v)?;
+            tts.speak(format!("This is {}.", v.name()), false)?;
+        }
+        if let Some(original_voice) = original_voice {
+            tts.set_voice(&original_voice)?;
         }
     }
     tts.speak("Goodbye.", false)?;