Selenium + Ruby - Working with conditions

Currently my test check if element is present in the screen. If element is present then run a specific action, else the test continuous normally. See my code:

require "selenium-webdriver"
require "rspec"
require 'rspec/expectations'


describe "Current Expense" do


  before(:all) do
    @driver = Selenium::WebDriver.for :firefox
    @base_url = "http://ift.tt/13YVqZu"
    @driver.manage.window.maximize
  end

  after(:all) do
    @driver.quit   
  end


  it "Check icon" do
    @driver.get(@base_url)
    if expect(@driver.find_element(:xpath, "//*[@href='/gallery/']").displayed?).to be_truthy 
      @driver.find_element(:xpath, "//*[@href='/gallery/']").click
      sleep 2
      puts "element appears"
    else 
      puts "element NOT appears"
    end
  end
end

When the element is present, the message appears, but when the element not is present in the page, occurs an error and the message of "ELSE" not run.

someone help me?