generate:entity should provide empty DAO along with empty BAO

src/CRM/CivixBundle/Command/AddEntityCommand.php

@@ -116,6 +116,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     if (in_array('4', $apiVersions)) {
       $ext->builders['api4.php'] = new Template('entity-api4.php.php', $ctx['api4File'], FALSE, Civix::templating());
     }
+    $ext->builders['dao.php'] = new Template('entity-dao.php.php', $ctx['daoClassFile'], FALSE, Civix::templating());
     $ext->builders['bao.php'] = new Template('entity-bao.php.php', $ctx['baoClassFile'], FALSE, Civix::templating());
     $ext->builders['entity.xml'] = new Template('entity-schema.xml.php', $ctx['schemaFile'], FALSE, Civix::templating());
 

src/CRM/CivixBundle/Resources/views/Code/entity-dao.php.php

@@ -0,0 +1,18 @@
+<?php
+echo "<?php\n";
+$_namespace = preg_replace(':/:', '_', $namespace);
+?>
+use <?php echo $_namespace ?>_ExtensionUtil as E;
+
+/**
+ * DAOs provide an OOP-style facade for reading and writing database records.
+ *
+ * DAOs are a primary source for metadata in several versions of CiviCRM (<5.75)
+ * and are required for some subsystems (such as APIv3).
+ *
+ * This stub provides compatibility. It is not intended to be modified in a
+ * substantive way. However, you may add comments and annotations.
+ */
+class <?php echo $daoClassName ?> extends CRM_Core_DAO {
+
+}