Allow empty single-line bodies in property accessors

idea/testData/quickfix/implement/abstract.kt.after

@@ -11,8 +11,7 @@ private abstract class Base {
 private class BaseImpl : Base() {
     override var x: Int
         get() = TODO("not implemented") //To change initializer of created properties use File | Settings | File Templates.
-        set(value) {
-        }
+        set(value) {}
 
     override fun toInt(arg: String): Int {
         TODO("not implemented") //To change body of created functions use File | Settings | File Templates.

idea/testData/quickfix/implement/nestedPrivateInterface.kt.after

@@ -10,7 +10,6 @@ class Container {
     class BaseImpl : Base {
         override var z: Double
             get() = TODO("not implemented") //To change initializer of created properties use File | Settings | File Templates.
-            set(value) {
-            }
+            set(value) {}
     }
 }