fix：过期时间不设置则就没有过期

docus-shiro-starter/src/main/java/com/docus/infrastructure/shiro/jwt/JwtTokenUtil.java

@@ -233,6 +233,9 @@ public class JwtTokenUtil {
             return true;
         } else {
             Date expiredDate = claimsFromToken.getExpiration();
+            if(expiredDate == null) {
+                return false;
+            }
             return expiredDate.before(new Date());
         }