fix: 修复获取 city 时可能的报错 (#8294)

Co-authored-by: ibuler <ibuler@qq.com>

apps/common/utils/ip/utils.py

@@ -74,13 +74,18 @@ def contains_ip(ip, ip_group):
 
 
 def get_ip_city(ip):
-    info = get_ip_city_by_ipip(ip)
-    city = info.get('city', _("Unknown"))
-    country = info.get('country')
+    if not ip or not isinstance(ip, str):
+        return _("Invalid ip")
+    if ':' in ip:
+        return 'IPv6'
 
-    # 国内城市 并且 语言是中文就使用国内
-    is_zh = settings.LANGUAGE_CODE.startswith('zh')
-    if country == '中国' and is_zh:
-        return city
-    else:
-        return get_ip_city_by_geoip(ip)
+    info = get_ip_city_by_ipip(ip)
+    if info:
+        city = info.get('city', _("Unknown"))
+        country = info.get('country')
+
+        # 国内城市 并且 语言是中文就使用国内
+        is_zh = settings.LANGUAGE_CODE.startswith('zh')
+        if country == '中国' and is_zh:
+            return city
+    return get_ip_city_by_geoip(ip)