Fix conversion to Scala Future

src/main/scala/reactor/core/scala/publisher/SMono.scala

@@ -1300,8 +1300,10 @@ trait SMono[T] extends SMonoLike[T, SMono] with MapablePublisher[T] with ScalaCo
   final def toFuture: Future[T] = {
     val promise = Promise[T]()
     coreMono.toFuture.handle[Unit]((value: T, throwable: Throwable) => {
-      Option(value).foreach(v => promise.complete(Try(v)))
-      Option(throwable).foreach(t => promise.failure(t))
+      Option(throwable) match {
+        case Some(_) => promise.failure(throwable)
+        case None => promise.complete(Success(value))
+      }
       ()
     })
     promise.future

src/test/scala/reactor/core/scala/publisher/SMonoTest.scala

@@ -1155,5 +1155,12 @@ class SMonoAsyncTest extends AsyncFreeSpec {
       }
       }
     }
+    ".toFuture should convert this mono to future with void return" in {
+      val future: Future[Int] = SMono.empty[Unit].toFuture.map(_ => 1)
+      future map { v => {
+        assert(v == 1)
+      }
+      }
+    }
   }
 }