Fix null array json converter.

Author: javadev

src/main/java/com/github/underscore/lodash/Xml.java

@@ -1087,6 +1087,7 @@ private static Object checkArray(final Map<String, Object> map, final String nam
         if (map.containsKey(ARRAY) && TRUE.equals(map.get(ARRAY))) {
             final Map<String, Object> localMap4 = (Map) ((LinkedHashMap) localMap).clone();
             localMap4.remove(ARRAY);
+            localMap4.remove(SELF_CLOSING);
             object = name.equals(XmlValue.getMapKey(localMap4))
                 ? U.newArrayList(Collections.singletonList(getValue(XmlValue.getMapValue(localMap4),
                     FromType.FOR_CONVERT)))

src/test/java/com/github/underscore/lodash/StringTest.java

@@ -2265,6 +2265,18 @@ public void toJsonFromXml28() {
         assertEquals(xml, U.toXml((Map<String, Object>) U.fromJson(json)));
     }
 
+    @SuppressWarnings("unchecked")
+    @Test
+    public void toJsonFromXml29() {
+        final String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
+            + "<root>\n"
+            + "  <element array=\"true\" null=\"true\"/>\n"
+            + "</root>";
+        final String json = "[\n  null\n]";
+        assertEquals(json, U.toJson((List<Object>) U.fromXml(xml)));
+        assertEquals(xml, U.toXml((List<Object>) U.fromJson(json)));
+    }
+
     @SuppressWarnings("unchecked")
     @Test
     public void toXmlFromJson() {