J2K: not initialized field of non-primitive type should have null initializer

#KT-11544 Fixed

j2k/testData/fileOrElement/field/internalField.kt

@@ -1,5 +1,4 @@
 // ERROR: Unresolved reference: Foo
-// ERROR: Property must be initialized or be abstract
 internal class C {
-    var f: Foo
+    var f: Foo? = null
 }

j2k/testData/fileOrElement/field/needInitializer.java

@@ -0,0 +1,22 @@
+public class Init {
+    public String field1;
+    public String field2;
+
+    public int field3;
+    public int field4;
+
+    public Init() {
+        field1 = "str";
+        field3 = 1;
+
+        String prop1;
+        prop1 = "aaa";
+
+        String prop2;
+
+        int prop3;
+        prop3 = 1;
+
+        int prop4;
+    }
+}

j2k/testData/fileOrElement/field/needInitializer.kt

@@ -0,0 +1,22 @@
+class Init {
+    var field1: String
+    var field2: String? = null
+
+    var field3: Int = 0
+    var field4: Int = 0
+
+    init {
+        field1 = "str"
+        field3 = 1
+
+        val prop1: String
+        prop1 = "aaa"
+
+        val prop2: String
+
+        val prop3: Int
+        prop3 = 1
+
+        val prop4: Int
+    }
+}

j2k/testData/fileOrElement/field/protectedField.kt

@@ -1,5 +1,4 @@
 // ERROR: Unresolved reference: Foo
-// ERROR: Property must be initialized or be abstract
 internal class C {
-    protected var f: Foo
+    protected var f: Foo? = null
 }

j2k/testData/fileOrElement/field/publicField.kt

@@ -1,5 +1,4 @@
 // ERROR: Unresolved reference: Foo
-// ERROR: Property must be initialized or be abstract
 internal class C {
-    var f: Foo
+    var f: Foo? = null
 }

j2k/testData/fileOrElement/field/varWithoutInit.kt

@@ -1,5 +1,4 @@
 // ERROR: Unresolved reference: Foo
-// ERROR: Property must be initialized or be abstract
 internal class C {
-    var f: Foo
+    var f: Foo? = null
 }