#980 - fix several bugs in findSingleAttibute - Refactor moving logic into DefaultOrmQuery setDefaultSelectClause() from findSingleAttributeList() (to support alternate calling via EbeanServer)

src/main/java/io/ebeaninternal/server/querydefn/OrmQueryDetail.java

@@ -174,6 +174,13 @@ public class OrmQueryDetail implements Serializable {
     return baseProps.isIncluded(property);
   }
 
+  /**
+   * Set the base query properties to be empty.
+   */
+  public void setEmptyBase() {
+    this.baseProps = new OrmQueryProperties(null, new LinkedHashSet<>());
+  }
+
   /**
    * Set the base / root query properties.
    */