[FE, Java resolve] Support inheritors of sealed Java type without permits clause

This fixes a false negative NO_ELSE_IN_WHEN in K2 and incidentally
also fixes a false positive NO_ELSE_IN_WHEN in K1 since the fix is in
the common code.

#KT-62491 Fixed

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaFacade.kt

@@ -387,7 +387,7 @@ abstract class FirJavaFacade(
             if (modality == Modality.SEALED) {
                 val permittedTypes = javaClass.permittedTypes
                 setSealedClassInheritors {
-                    permittedTypes.mapNotNull { classifierType ->
+                    permittedTypes.mapNotNullTo(mutableListOf()) { classifierType ->
                         val classifier = classifierType.classifier as? JavaClass
                         classifier?.let { JavaToKotlinClassMap.mapJavaToKotlin(it.fqName!!) ?: it.classId }
                     }