Fix inconsistent return points.

Author: derrabus

Command/InitAclCommand.php

@@ -109,5 +109,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $output->writeln('ACL tables have been initialized successfully.');
+
+        return null;
     }
 }

Command/UserPasswordEncoderCommand.php

@@ -168,6 +168,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $errorIo->success('Password encoding succeeded');
+
+        return null;
     }
 
     /**