Storage: small fixes to 'storage move'

- stop command if current storage backend is still "legacy"
- write destination backend name in log

src/Console/Storage.php

@@ -23,6 +23,7 @@ namespace Friendica\Console;
 
 use Asika\SimpleConsole\CommandArgsException;
 use Friendica\Core\StorageManager;
+use Friendica\Model\Storage\StorageException;
 
 /**
  * tool to manage storage backend and stored data from CLI
@@ -165,6 +166,10 @@ HELP;
 		$current = $this->storageManager->getBackend();
 		$total = 0;
 
+		if (is_null($current)) {
+			throw new StorageException(sprintf("Cannot move to legacy storage. Please select a storage backend."));
+		}
+
 		do {
 			$moved = $this->storageManager->move($current, $tables, $this->getOption('n', 5000));
 			if ($moved) {

src/Core/StorageManager.php

@@ -305,7 +305,7 @@ class StorageManager
 					$data = $source->get($sourceRef);
 				}
 
-				$this->logger->info('Save data to new backend.', ['newBackend' => $destination]);
+				$this->logger->info('Save data to new backend.', ['newBackend' => $destination::getName()]);
 				$destinationRef = $destination->put($data);
 				$this->logger->info('Saved data.', ['newReference' => $destinationRef]);