Improve output

- Remove unnecesary break lines
- Do not show updated packages list when it comes empty

src/UpdaterCommand.php

@@ -398,9 +398,11 @@ protected function updatePackage(string $package) {
 
     }
 
-    $this->output->writeln("\nUpdated packages:");
     $updated_packages = trim($this->runCommand('composer-lock-diff')->getOutput());
-    $this->output->writeln($updated_packages . "\n");
+    if (!empty($updated_packages)) {
+      $this->output->writeln("Updated packages:");
+      $this->output->writeln($updated_packages);
+    }
 
     $commit_message = $this->calculateModuleUpdateCommitMessage($package);