Do not generate no-arg constructor for sealed ultra-light class

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/ultraLightPsi.kt

@@ -377,6 +377,7 @@ open class KtUltraLightClass(classOrObject: KtClassOrObject, internal val suppor
     private fun shouldGenerateNoArgOverload(primary: KtPrimaryConstructor): Boolean {
         return !primary.hasModifier(PRIVATE_KEYWORD) &&
                 !classOrObject.hasModifier(INNER_KEYWORD) && !isEnum &&
+                !classOrObject.hasModifier(SEALED_KEYWORD) &&
                 primary.valueParameters.isNotEmpty() &&
                 primary.valueParameters.all { it.defaultValue != null } &&
                 classOrObject.allConstructors.none { it.valueParameters.isEmpty() }

compiler/testData/asJava/ultraLightClasses/constructors.kt

@@ -11,3 +11,7 @@ class Outer {
     inner class Inner(x: Int = 1, y: String = "")
     class Nested(x: Int = 1, y: String = "")
 }
+
+sealed class A(val x: String? = null) {
+    class C : A()
+}