Cleanup configuration by removing non-existent imports

Fix a syntax issue

src/Handler.php

@@ -56,8 +56,28 @@ class Handler extends BaseHandler {
         }
       }
     }
+
+    // Cleanup configuration: remove non-existant includes.
+    foreach ($ahoy['commands'] as $command => $commands) {
+      if (isset($commands['imports']) && is_array($commands['imports'])) {
+        $deleteKeys = [];
+        foreach ($commands['imports'] as $key => $import) {
+          if (!file_exists($import)) {
+            $deleteKeys[] = $key;
+          }
+        }
+        arsort($deleteKeys);
+        foreach ($deleteKeys as $deleteKey) {
+          unset($ahoy['commands'][$command]['imports'][$deleteKey]);
+        }
+        if (empty($ahoy['commands'][$command]['imports'])) {
+          unset($ahoy['commands'][$command]);
+        }
+      }
+    }
+
     $file = $rootDir . '/.ahoy.yml';
-    file_put_contents($file, $rendered = Yaml::dump($ahoy, 9, 2));
+    file_put_contents($file, Yaml::dump($ahoy, 9, 2));
     $this->gitIgnore('.ahoy.yml');
   }