修复handle rule 缓存未删除的bug

Author: saleson

spring-cloud-gray-client/src/main/java/cn/springcloud/gray/handle/DefaultHandleRuleManager.java

@@ -118,6 +118,8 @@ private void resetHandleRuleInfos(String handleRuleType) {
                 .collect(Collectors.toList());
         if (!handleRuleInfos.isEmpty()) {
             handleRuleTypeInfos.put(handleRuleType, handleRuleInfos);
+        } else {
+            handleRuleTypeInfos.remove(handleRuleType);
         }
     }