Ruby on Rails

module MessagesHelper

def recipients_options
s = ''
users = User.all + BizUser.all; users.each do |user|
s << "<option value='#{user.id}'
data-img-src='#{attachment_url(@user, user.email, :profile_avatar,
:fill, 50, 50)}'>#{user.username}</option>"
end
s.html_safe
end
end

How would I pass if nil to the attachment_url for user :profile_avatar?
when the image isn't available.

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