Fix for Issue 62 - Query.setId should not return all results for null input Object

src/main/java/com/avaje/ebeaninternal/server/expression/DefaultExpressionFactory.java

@@ -244,6 +244,9 @@ public class DefaultExpressionFactory implements SpiExpressionFactory {
    * Id Equal to - ID property is equal to the value.
    */
   public Expression idEq(Object value) {
+    if (value == null) {
+      throw new NullPointerException("The id value is null");
+    }
     return new IdExpression(value);
   }