yiic migrate/create should not require db component

framework/yii/console/controllers/MigrateController.php

@@ -115,12 +115,14 @@ class MigrateController extends Controller
 			}
 			$this->migrationPath = $path;
 
+			if($action->id!=='create') {
 				if (is_string($this->db)) {
 					$this->db = Yii::$app->getComponent($this->db);
 				}
 				if (!$this->db instanceof Connection) {
 					throw new Exception("The 'db' option must refer to the application component ID of a DB connection.");
 				}
+			}
 
 			$version = Yii::getVersion();
 			echo "Yii Migration Tool (based on Yii v{$version})\n\n";