Java to Kotlin converter: more smartness about nullability

j2k/tests/testData/ast/nullability/MethodResultInitializesNullableField.kt

@@ -0,0 +1,10 @@
+class C() {
+    private val string: String? = getString()
+
+    class object {
+
+        fun getString(): String? {
+            return x()
+        }
+    }
+}