[5.6] Throws an exception if the command doesn't exist (#23942)

src/Illuminate/Console/Application.php

@@ -16,6 +16,7 @@
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Application as SymfonyApplication;
 use Symfony\Component\Console\Command\Command as SymfonyCommand;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
 use Illuminate\Contracts\Console\Application as ApplicationContract;
 
 class Application extends SymfonyApplication implements ApplicationContract
@@ -172,6 +173,10 @@ public function call($command, array $parameters = [], $outputBuffer = null)
             $command = $this->laravel->make($command)->getName();
         }
 
+        if (! $this->has($command)) {
+            throw new CommandNotFoundException(sprintf('The command "%s" does not exist.', $command));
+        }
+
         array_unshift($parameters, $command);
 
         $this->lastOutput = $outputBuffer ?: new BufferedOutput;