Merge branch 'develop' into wk_bugs
Merge branch 'develop' into wk_bugs
Update the qrcode judgement and repair the core data issue

二维码扫描对签名的判断逻辑和core data闪退问题修复
Merge branch 'wk_bugs' into develop
Merge branch 'develop' into wk_bugs
repair for the sign picture

签名图空白，修复
Merge branch 'wk_bugs' into develop
Merge branch 'develop' into wk_bugs
repair bugs

联系条目删除44、删除签名图形后页面空白46、编辑联系人时的光标位置、图片签名图
Merge branch 'wk_bugs' into develop
同步问题修正

因为接口中没有单独同步签名图的参数取值，暂时放弃同步优化方式，采用每次同步都完整更新数据的办法。
增加更多空指针判断以便在异常网络状况下的闪退问题。
Merge branch 'develop'