Fix missing sounds (#4466)

* Fix missing sounds

* Make SoundHitSpecies fallback to SoundHit

* Fix crayon YAML

* Update PlaySoundBehavior YAML

* Fix required

Content.Shared/Light/Component/SharedExpendableLightComponent.cs

@@ -73,11 +73,11 @@ namespace Content.Shared.Light.Component
         protected SoundSpecifier LitSound { get; set; } = default!;
 
         [ViewVariables]
-        [DataField("loopedSound", required: true)]
-        public string LoopedSound { get; set; } = string.Empty;
+        [DataField("loopedSound")]
+        public string? LoopedSound { get; set; } = null;
 
         [ViewVariables]
         [DataField("dieSound")]
-        protected SoundSpecifier DieSound { get; set; } = default!;
+        protected SoundSpecifier? DieSound { get; set; } = null;
     }
 }