为什么在用户更新时没有更新密码(Rails 4带有“has_secure_password”)，为什么我的“密码不能为空”?

In my Rails 4.0.9 app, using BCrypt 3.1.7 and Clearance 1.4.2 for authentication, I'm getting an error returned when updating a user's info. Despite not entering a new password or password confirmation, I get the error "Password can't be blank."In my Rails 4.0.9 app, using BCrypt 3.1.7 and C