feats

src/main/java/com/njyunzhi/pet_identity/service/impl/TaCardNoServiceImpl.java

 
     @Override
     public String getFormatNo(String prefix, Integer num) {
+        if (StringUtils.isEmpty(prefix) || num == null) return null;
+
         int maxLen = 5;
         return String.format("%s%s", prefix, StringUtils.lpad(num.toString(), "0", maxLen));
     }