Smart completion: "null" when nullable value expected

idea/testData/completion/handlers/smart/ConstructorForNullable.kt

@@ -3,3 +3,5 @@ class Foo
 fun foo(p : Any){
     var a : Foo? = <caret>
 }
+
+// ELEMENT: Foo

idea/testData/completion/handlers/smart/ConstructorForNullable.kt.after

@@ -3,3 +3,5 @@ class Foo
 fun foo(p : Any){
     var a : Foo? = Foo()<caret>
 }
+
+// ELEMENT: Foo

idea/testData/completion/handlers/smart/MergeTail2.kt

@@ -6,3 +6,5 @@ fun foo(c: C?, i: Int){}
 fun foo() {
     foo(<caret>
 }
+
+// ELEMENT: C

idea/testData/completion/handlers/smart/MergeTail2.kt.after

@@ -6,3 +6,5 @@ fun foo(c: C?, i: Int){}
 fun foo() {
     foo(C()<caret>
 }
+
+// ELEMENT: C

idea/testData/completion/smart/Null.kt

@@ -0,0 +1,7 @@
+fun foo(p: String?) {}
+
+fun bar() {
+    foo(<caret>)
+}
+
+// EXIST: null