Fix: query table entity or sql entity has no id (#1082)

When query table entity or sql entity，include NamedQuery which modified via code and RawSqlQuery which modified via code.

src/main/java/io/ebeaninternal/server/expression/DefaultExpressionList.java

@@ -1107,6 +1107,9 @@ public class DefaultExpressionList<T> implements SpiExpressionList<T> {
   }
 
   public Object idEqualTo(String idName) {
+    if (idName == null) {
+      return null;
+    }
     if (list.size() == 1) {
       return list.get(0).getIdEqualTo(idName);
     }