Fixed KT-5985 Smart completion does not insert comma for constructor of nested data class

#KT-5985 Fixed

idea/src/org/jetbrains/jet/plugin/completion/ExpectedInfos.kt

@@ -131,9 +131,18 @@ class ExpectedInfos(val bindingContext: BindingContext, val resolveSession: Reso
         val callOperationNode: ASTNode?
         if (parent is JetQualifiedExpression && callElement == parent.getSelectorExpression()) {
             val receiverExpression = parent.getReceiverExpression()
-            val expressionType = bindingContext[BindingContext.EXPRESSION_TYPE, receiverExpression] ?: return null
-            receiver = ExpressionReceiver(receiverExpression, expressionType)
-            callOperationNode = parent.getOperationTokenNode()
+            val expressionType = bindingContext[BindingContext.EXPRESSION_TYPE, receiverExpression]
+            if (expressionType != null) {
+                receiver = ExpressionReceiver(receiverExpression, expressionType)
+                callOperationNode = parent.getOperationTokenNode()
+            }
+            else if (bindingContext[BindingContext.QUALIFIER, receiverExpression] != null) {
+                receiver = ReceiverValue.NO_RECEIVER
+                callOperationNode = null
+            }
+            else {
+                return null
+            }
         }
         else {
             receiver = ReceiverValue.NO_RECEIVER

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

@@ -0,0 +1,9 @@
+class Outer {
+    private data class Nested(val v: Int, val v2: Int)
+
+    fun foo(p: Int): Inner {
+        return Outer.Nested(<caret>)
+    }
+}
+
+// ELEMENT: p

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

@@ -0,0 +1,9 @@
+class Outer {
+    private data class Nested(val v: Int, val v2: Int)
+
+    fun foo(p: Int): Inner {
+        return Outer.Nested(p, <caret>)
+    }
+}
+
+// ELEMENT: p