Improved formatting and performance of YAMLProcessor when no comments are present

src/main/java/com/sk89q/util/yaml/YAMLProcessor.java

@@ -183,8 +183,11 @@ public class YAMLProcessor extends YAMLNode {
                 writer.append(header);
                 writer.append(LINE_BREAK);
             }
+            if (comments.size() == 0) {
+                yaml.dump(root, writer);
+            } else {
                 // Iterate over each root-level property and dump
-            for (Iterator<Map.Entry<String, Object>> i = root.entrySet().iterator(); i.hasNext();) {
+                for (Iterator<Map.Entry<String, Object>> i = root.entrySet().iterator(); i.hasNext(); ) {
                     Map.Entry<String, Object> entry = i.next();
 
                     // Output comment, if present
@@ -198,6 +201,7 @@ public class YAMLProcessor extends YAMLNode {
                     // Dump property
                     yaml.dump(Collections.singletonMap(entry.getKey(), entry.getValue()), writer);
                 }
+            }
             return true;
         } catch (IOException e) {
         } finally {