Move statement: Add or remove empty lines correctly

#KT-14946 Fixed

idea/testData/codeInsight/moveUpDown/classBodyDeclarations/class/kt-14946-1.kt

@@ -0,0 +1,10 @@
+// MOVE: down
+class Outer {
+    <caret>class N1 {
+        fun foo1() {}
+    }
+
+    class N2 {
+        fun foo2() {}
+    }
+}