学生管理修改学生信息头像修复

suser/src/main/resources/mapper/system/UserMapper.xml

         ,usertime =#{user.usertime},createtime=#{user.createtime},usersex=#{user.usersex}
         <if test="user.userphone!=null and user.userphone!=''">,userphone =#{user.userphone}</if>
         <if test="user.bindphoned!=null">,bindphoned =#{user.bindphoned}</if>
+        <if test="user.headpic!=null and user.headpic!=''">,headpic=#{user.headpic}</if>
         where userid=#{user.userid}
     </update>
 </mapper>