style: 规范写法

src/onebot/cqcode.ts

@@ -15,10 +15,12 @@ function from(source: string) {
     if (!capture) return null;
     const [, type, attrs] = capture;
     const data: Record<string, any> = {};
-    attrs && attrs.slice(1).split(',').forEach((str) => {
-        const index = str.indexOf('=');
-        data[str.slice(0, index)] = unescape(str.slice(index + 1));
-    });
+    if (attrs) {
+        attrs.slice(1).split(',').forEach((str) => {
+            const index = str.indexOf('=');
+            data[str.slice(0, index)] = unescape(str.slice(index + 1));
+        });
+    }
     return { type, data, capture };
 }