Move: Do not skip usages of declarations without light elements

#KT-18873 Fixed

idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/MoveKotlinDeclarationsProcessor.kt

@@ -52,6 +52,7 @@ import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.psiUtil.containingClassOrObject
 import org.jetbrains.kotlin.psi.psiUtil.getElementTextWithContext
 import org.jetbrains.kotlin.psi.psiUtil.isAncestor
+import org.jetbrains.kotlin.utils.ifEmpty
 import org.jetbrains.kotlin.utils.keysToMap
 import java.lang.AssertionError
 import java.util.*
@@ -129,7 +130,7 @@ class MoveKotlinDeclarationsProcessor(
     private val elementsToMove = descriptor.elementsToMove.filter { e -> e.parent != descriptor.moveTarget.getTargetPsiIfExists(e) }
     private val kotlinToLightElementsBySourceFile = elementsToMove
             .groupBy { it.containingKtFile }
-            .mapValues { it.value.keysToMap { it.toLightElements() } }
+            .mapValues { it.value.keysToMap { it.toLightElements().ifEmpty { listOf(it) } } }
     private val conflicts = MultiMap<PsiElement, String>()
 
     override fun getRefactoringId() = REFACTORING_ID

idea/testData/refactoring/move/kotlin/changePackage/headerClasses/after/headers/classes/classes.kt

@@ -0,0 +1,6 @@
+package headers.classes
+
+import headers2.funs3.NonHeaderClass
+import headers2.funs3.HeaderClass
+
+fun f(p: HeaderClass) = NonHeaderClass()

idea/testData/refactoring/move/kotlin/changePackage/headerClasses/after/headers/funs/funs.kt

@@ -0,0 +1,4 @@
+package headers2.funs3
+
+class NonHeaderClass
+header class HeaderClass

idea/testData/refactoring/move/kotlin/changePackage/headerClasses/before/headers/classes/classes.kt

@@ -0,0 +1,6 @@
+package headers.classes
+
+import headers.funs.NonHeaderClass
+import headers.funs.HeaderClass
+
+fun f(p: HeaderClass) = NonHeaderClass()

idea/testData/refactoring/move/kotlin/changePackage/headerClasses/before/headers/funs/funs.kt

@@ -0,0 +1,4 @@
+package headers.funs
+
+class NonHeaderClass
+header class HeaderClass

idea/testData/refactoring/move/kotlin/changePackage/headerClasses/headerClasses.test

@@ -0,0 +1,5 @@
+{
+  "mainFile": "headers/funs/funs.kt",
+  "type": "CHANGE_PACKAGE_DIRECTIVE",
+  "newPackageName": "headers2.funs3"
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/move/MoveTestGenerated.java

@@ -228,6 +228,12 @@ public class MoveTestGenerated extends AbstractMoveTest {
         doTest(fileName);
     }
 
+    @TestMetadata("kotlin/changePackage/headerClasses/headerClasses.test")
+    public void testKotlin_changePackage_headerClasses_HeaderClasses() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/move/kotlin/changePackage/headerClasses/headerClasses.test");
+        doTest(fileName);
+    }
+
     @TestMetadata("kotlin/moveDirectory/moveDirectoryWithPackageDirectiveChange/moveDirectoryWithPackageDirectiveChange.test")
     public void testKotlin_moveDirectory_moveDirectoryWithPackageDirectiveChange_MoveDirectoryWithPackageDirectiveChange() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/move/kotlin/moveDirectory/moveDirectoryWithPackageDirectiveChange/moveDirectoryWithPackageDirectiveChange.test");