Fixing squid:S1155 - Collection.isEmpty() should be used to test for emptiness

src/main/java/com/avaje/ebeaninternal/server/query/SqlTreeBuilder.java

@@ -417,7 +417,7 @@ public class SqlTreeBuilder {
     // This makes sense for transient properties used to
     // hold sum() count() type values (with SqlSelect)
     for (String propName : queryProps.getSelectProperties()) {
-      if (propName.length() > 0) {
+      if (!propName.isEmpty()) {
         addProperty(selectProps, desc, queryProps, propName);
       }
     }