Allow empty single-line bodies in property accessors

idea/idea-completion/testData/handlers/basic/override/ImplementVar.kt.after

@@ -5,8 +5,7 @@ interface I {
 class A : I {
     override var someVar: String
         get() = <caret><selection>TODO("not implemented")</selection> //To change initializer of created properties use File | Settings | File Templates.
-        set(value) {
-        }
+        set(value) {}
 }
 
 // ELEMENT_TEXT: "override var someVar: String"

idea/idea-completion/testData/handlers/basic/override/OverrideVar.kt.after

@@ -5,8 +5,7 @@ open class B {
 class A : B {
     override var someVar: String
         get() = <caret><selection>super.someVar</selection>
-        set(value) {
-        }
+        set(value) {}
 }
 
 // ELEMENT_TEXT: "override var someVar: String"