更新签名图片加载逻辑

module/achievement/excel.py

@@ -293,17 +293,17 @@ class ExcelReader:
 
     def _load_signature_images(self):
         signature_cells = {
-            "major_director_signature_image": "K34",
-            "course_leader_signature_image": "K35",
+            "major_director_signature_image": ("I34", "K34"),
+            "course_leader_signature_image": ("I35", "K35"),
         }
         wb_with_images: Workbook = openpyxl.load_workbook(self.file_path, data_only=True)
         try:
             sheet_with_images: Worksheet = wb_with_images["初始录入"]
             loader = self._SheetImageLoader(sheet_with_images)
 
-            for attr, cell in signature_cells.items():
-                if loader.image_in(cell):
-                    setattr(self, attr, loader.get(cell))
+            for attr, (check_cell, image_cell) in signature_cells.items():
+                if sheet_with_images[check_cell].value and loader.image_in(image_cell):
+                    setattr(self, attr, loader.get(image_cell))
                 else:
                     setattr(self, attr, None)
         finally: