Fix unexpected Xml.getRootName(localMap) returns null.

Author: xhaggi

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

@@ -960,18 +960,21 @@ private static XmlStringBuilder checkStandalone(String encoding, XmlStringBuilde
     private static String getRootName(final Map localMap) {
         int foundAttrs = 0;
         int foundElements = 0;
+        int foundListElements = 0;
         if (localMap != null) {
             for (Map.Entry entry : (Set<Map.Entry>) localMap.entrySet()) {
                 if (String.valueOf(entry.getKey()).startsWith("-")) {
                     foundAttrs += 1;
                 } else if (!String.valueOf(entry.getKey()).startsWith(COMMENT)
-                        && !String.valueOf(entry.getKey()).startsWith("?")
-                        && (!(entry.getValue() instanceof List) || ((List) entry.getValue()).size() <= 1)) {
+                        && !String.valueOf(entry.getKey()).startsWith("?")) {
+                    if (entry.getValue() instanceof List && ((List) entry.getValue()).size() > 1) {
+                        foundListElements += 1;
+                    }
                     foundElements += 1;
                 }
             }
         }
-        return foundAttrs == 0 && foundElements == 1 ? null : "root";
+        return foundAttrs == 0 && foundElements == 1 && foundListElements == 0 ? null : "root";
     }
 
     public static String toXml(Map map) {

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

@@ -600,6 +600,16 @@ public void jsonToXml() {
             U.chain("{\n  \"a\": {\n  }\n}").jsonToXml().item());
         assertEquals("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<root empty-array=\"true\"></root>",
             U.jsonToXml("[]"));
+        assertEquals("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
+                + "<root>\n"
+                + "  <a>\n"
+                + "    <b>v1</b>\n"
+                + "  </a>\n"
+                + "  <c>v1</c>\n"
+                + "  <c>v2</c>\n"
+                + "  <c>v3</c>\n"
+                + "</root>",
+            U.jsonToXml("{\"a\" : {\n \"b\" : \"v1\" }, \"c\" : [\"v1\", \"v2\", \"v3\"]}"));
     }
 
     @Test