fix an issue(geetest)

src/main/java/cn/quantgroup/xyqb/service/v2/GeetestBehaviorStrategy.java

@@ -85,7 +85,7 @@ public class GeetestBehaviorStrategy implements BehaviorStrategy {
                     ).offline(false).newCaptcha(true).
                     build());
             String registerReDt = LocalDateTime.now().toString();
-            imgMap.put(Constants.QG_CAPTCHA_INITDT, behaviorReq.getInitializeDt() == null ? null : behaviorReq.getInitializeDt().toString());
+            imgMap.put(Constants.QG_CAPTCHA_INITDT, behaviorReq.getInitializeDt() == null ? LocalDateTime.now().toString() : behaviorReq.getInitializeDt().toString());
             imgMap.put(Constants.QG_CAPTCHA_REGISTERDT, registerDt);
             imgMap.put(Constants.QG_CAPTCHA_REGISTERREDT, registerReDt);