Override/Implement Members: Support "Copy JavaDoc" options for library classes

#KT-12997 Fixed

ChangeLog.md

@@ -161,6 +161,7 @@ These artifacts include extensions for the types available in the latter JDKs, s
 - [`KT-13084`](https://youtrack.jetbrains.com/issue/KT-13084) Run test method action executes all tests from same kotlin file
 - [`KT-12718`](https://youtrack.jetbrains.com/issue/KT-12718) Deadlock due to index reentering
 - [`KT-13114`](https://youtrack.jetbrains.com/issue/KT-13114) 'Unused declaration' option 'JUnit static methods' is always enabled
+- [`KT-12997`](https://youtrack.jetbrains.com/issue/KT-12997) Override/Implement Members: Support "Copy JavaDoc" options for library classes
 - [`KT-13207`](https://youtrack.jetbrains.com/issue/KT-13207) Exception on safe delete from intention in 2016.2
 - [`KT-12887`](https://youtrack.jetbrains.com/issue/KT-12887) "Extend selection" should select call's invoked expression
 - Fix exception when choose Gradle configurer after project is synced

idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMemberChooserObject.kt

@@ -104,7 +104,7 @@ fun OverrideMemberChooserObject.generateMember(project: Project, copyDoc: Boolea
     }
 
     if (copyDoc) {
-        val superDeclaration = DescriptorToSourceUtilsIde.getAnyDeclaration(project, descriptor)
+        val superDeclaration = DescriptorToSourceUtilsIde.getAnyDeclaration(project, descriptor)?.navigationElement
         val kDoc = when (superDeclaration) {
             is KtDeclaration ->
                 findDocComment(superDeclaration)