[NI] Don't complete nested call if there's no constraints at all

compiler/testData/diagnostics/tests/inference/constraints/returnLambdaFromLambda.kt

@@ -9,13 +9,13 @@ fun testLambda() {
         { it -> <!DEBUG_INFO_SMARTCAST!>x<!> + it }
     }
 
-    val twoLambda: (Int) -> Int = <!TYPE_MISMATCH!>myRun {
+    val twoLambda: (Int) -> Int = myRun {
         val x: Int = 1
-        <!TYPE_MISMATCH!>run {
+        run {
             val y: Int = 2
             { x + y }
-        }<!>
-    }<!>
+        }
+    }
 
 }