Handle ChromeDriver returning null for findElements call

Author: p0deje

rb/lib/selenium/webdriver/remote/oss/bridge.rb

@@ -558,6 +558,8 @@ def find_elements_by(how, what, parent = nil)
                   else
                     execute :find_elements, {}, {using: how, value: what}
                   end
+            # see https://github.com/SeleniumHQ/selenium/issues/4555
+            ids ||= []
 
             ids.map { |id| Element.new self, element_id_from(id) }
           end