add 'No Designation' to mark_list(list of designation type ex. Country, City etc.) and skip mark paste process if mark is 'No Designation'

src/display_message_en.json

@@ -29,7 +29,7 @@
         "紫": "Purple: Ruins related to foreigners and foreign countries"
     },
     "label_mark": "Designation Type",
-    "mark_list": ["国指定", "都指定", "道指定", "府指定", "県指定", "区指定", "市指定", "町指定", "村指定"],
+    "mark_list": ["国指定", "都指定", "道指定", "府指定", "県指定", "区指定", "市指定", "町指定", "村指定", "指定無し"],
     "label_historic_site_type": "Historic Site Type",
     "placeholder_historic_site_type": "ex. Statue, Monument, Site, etc.",
     "label_difficulty": "Difficulty",

src/display_message_ja.json

@@ -29,7 +29,7 @@
         "紫": "「紫」: 外国及び外国人に関する遺跡"
     },
     "label_mark": "指定種類",
-    "mark_list": ["国指定", "都指定", "道指定", "府指定", "県指定", "区指定", "市指定", "町指定", "村指定"],
+    "mark_list": ["国指定", "都指定", "道指定", "府指定", "県指定", "区指定", "市指定", "町指定", "村指定", "指定無し"],
     "label_historic_site_type": "史跡種類",
     "placeholder_historic_site_type": "ex.銅像、石碑、記念碑、跡地、モニュメントなど。",
     "label_difficulty": "訪問難度",

src/front_card_image_historic_site.py

@@ -81,8 +81,9 @@ def create_historic_site_card_image(img_bytearray, option_dict):
     card_img = Image.open(card_frame_path_dict[option_dict['色']])
 
     # Adding a Marker
-    mark_image = Image.open(card_mark_path_dict[option_dict['マーク']])
-    card_img.paste(mark_image, mask=mark_image)
+    if option_dict['マーク'] in card_mark_path_dict:
+        mark_image = Image.open(card_mark_path_dict[option_dict['マーク']])
+        card_img.paste(mark_image, mask=mark_image)
 
     # Embedding a Picture in the Card
     card_img.paste(picture_img, PICTURE_LT_XY)