修复持续时间为负数的情况

src/main/java/cn/qg/holmes/utils/DingdingUtils.java

@@ -343,6 +343,10 @@ public class DingdingUtils {
                 DateTime startDate = issue.getCreationDate();
                 DateTime curDate = new DateTime();
                 int duration = calculateBugFixTime(startDate, curDate);
+                // 异常情况处理
+                if (duration < 0) {
+                    duration = 1;
+                }
                 content += "- 持续时间：" + duration + "小时\n\n";
             }
             content += "**截止当前，共有" + String.valueOf(count) + "个工单未解决，请对应经办人尽快跟进解决**";