avoid empty body warnings emposed by default activation of expandEmptyElements

Author: Pankraz76

lib/src/main/java/com/diffplug/spotless/pom/SortPomCfg.java

@@ -27,7 +27,7 @@ public class SortPomCfg implements Serializable {
 
 	public String lineSeparator = System.getProperty("line.separator");
 
-	public boolean expandEmptyElements = true;
+	public boolean expandEmptyElements;
 
 	public boolean spaceBeforeCloseEmptyElement = false;