Fix: moved file = after file presence validation (#23453)

Signed-off-by: Yongtao Huang <yongtaoh2022@gmail.com>

api/controllers/console/app/annotation.py

@@ -225,14 +225,15 @@ class AnnotationBatchImportApi(Resource):
             raise Forbidden()
 
         app_id = str(app_id)
-        # get file from request
-        file = request.files["file"]
         # check file
         if "file" not in request.files:
             raise NoFileUploadedError()
 
         if len(request.files) > 1:
             raise TooManyFilesError()
+
+        # get file from request
+        file = request.files["file"]
         # check file type
         if not file.filename or not file.filename.lower().endswith(".csv"):
             raise ValueError("Invalid file type. Only CSV files are allowed")