[rb] support remote sending nil to #send_keys

Author: titusfortner

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

@@ -392,7 +392,7 @@ def send_keys_to_element(element, keys)
           # TODO: rework file detectors before Selenium 4.0
           if @file_detector
             local_files = keys.first&.split("\n")&.map { |key| @file_detector.call(Array(key)) }&.compact
-            if local_files.any?
+            if local_files&.any?
               keys = local_files.map { |local_file| upload(local_file) }
               keys = Array(keys.join("\n"))
             end

rb/spec/integration/selenium/webdriver/element_spec.rb

@@ -87,6 +87,14 @@ module WebDriver
         end
       end
 
+      it 'should send empty keys' do
+        driver.navigate.to url_for('formPage.html')
+        element = wait_for_element(id: 'working')
+        element.send_keys
+        expect(element.text).to be_empty
+      end
+
+
       it 'should send string keys' do
         driver.navigate.to url_for('formPage.html')
         wait_for_element(id: 'working')