KT-1648 Function0<Tuple0> appears in the result of the Implement abstract members quick fix

#KT-1648 fixed

idea/testData/codeInsight/overrideImplement/functionProperty.kt.after

@@ -0,0 +1,10 @@
+// From KT-1648
+trait A {
+    val method:() -> Unit?
+}
+
+fun some() : A {
+    return object A {
+        override val method : () -> Unit? = ?
+    }
+}