KJS: fix stub consistency test which was broken after JsonClass was renamed and transformed to object

`kotlin.js.Console` is used instead of `kotlin.js.JSON` to avoid problems on case-sensitive filesystems since right now we also have `kotlin.js.Json` (will be removed later)

idea/tests/org/jetbrains/kotlin/idea/decompiler/stubBuilder/KotlinJavaScriptStubConsistencyTest.kt

@@ -30,7 +30,7 @@ class KotlinJavaScriptStubConsistencyTest : StubConsistencyBaseTest() {
     override fun getFileIds() = listOf(
             "jquery", "jquery.ui",
             "kotlin", "kotlin.collections", "kotlin.browser", "kotlin.dom", "kotlin.js"
-    ).map { OldPackageFacadeClassUtils.getPackageClassId(FqName(it)) } + ClassId.topLevel(FqName("kotlin.js.JsonClass"))
+    ).map { OldPackageFacadeClassUtils.getPackageClassId(FqName(it)) } + ClassId.topLevel(FqName("kotlin.js.Console"))
 
     override fun getVirtualFileFinder(): VirtualFileFinder =
         JsVirtualFileFinder.SERVICE.getInstance(project)

idea/tests/org/jetbrains/kotlin/idea/decompiler/stubBuilder/StubConsistencyBaseTest.kt

@@ -41,7 +41,7 @@ abstract class StubConsistencyBaseTest : KotlinLightCodeInsightFixtureTestCase()
 
     private fun doTest(id: ClassId) {
         val project = project
-        val packageFile = getVirtualFileFinder().findVirtualFileWithHeader(id)!!
+        val packageFile = getVirtualFileFinder().findVirtualFileWithHeader(id) ?: throw AssertionError("File not found for id: $id")
         val decompiledText = getDecompiledText(packageFile)
         val fileWithDecompiledText = KtPsiFactory(project).createFile(decompiledText)
         val stubTreeFromDecompiledText = KtFileStubBuilder().buildStubTree(fileWithDecompiledText)