refactor(ocr): 优化 OCR 记录中图片 URL 的处理逻辑

app/Controllers/Http/OcrRecordController.ts

@@ -34,6 +34,8 @@ export default class OcrRecordController {
                         record.img = await Drive.getSignedUrl(
                             new URL(record.img).pathname.replace(/^\//, '')
                         )
+                    } else {
+                        record.img = ''
                     }
                 })
             )