限制活动简介字数

Signed-off-by: wolf <liubing.wolf@gmail.com>
Merge branch 'develop' of https://github.com/HeraldStudio/EzHerald into develop
活动Grabber空指针bug解决

Signed-off-by: wolf <liubing.wolf@gmail.com>
Merge branch 'develop' of https://github.com/HeraldStudio/EzHerald into develop