Merge pull request '#852 修改加入月份，如果不足1月，则使用1月' (#853) from zouap_static into V20211115

Reviewed-on: https://git.openi.org.cn/OpenI/aiforge/pulls/853
Reviewed-by: lewis <747342561@qq.com>

models/user_business_analysis.go

@@ -674,5 +674,8 @@ func subMonth(t1, t2 time.Time) (month int) {
 	}
 	monthInterval %= 12
 	month = yearInterval*12 + monthInterval
+	if month == 0 {
+		month = 1
+	}
 	return month
 }