[oden-js] Convert Option<>

oden-js/src/conversion/into.rs

@@ -128,3 +128,13 @@ impl<T: Class> TryIntoValue for T {
         self.into_value(ctx)
     }
 }
+
+impl<T: TryIntoValue> TryIntoValue for Option<T> {
+    #[inline]
+    fn try_into_value(self, ctx: &ContextRef) -> ValueResult {
+        match self {
+            None => Ok(ctx.undefined()),
+            Some(v) => v.try_into_value(ctx),
+        }
+    }
+}