example:
get_balance(user_id, user_state = nil)
	if user_state.blank?
		Balance.get(:user_id => user_id, :user_state => user_state)
	else
		Balance.get(:user_id => user_id)
	end
end
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Another example:
if !message.blank?
	Notification.notify(:email, {:album_id => album_id, :message => message})
else
	Notification.notify(:email, {:album_id => album_id})
end