bugfix: suppress deprecation warning when no extensions were added to profile

Signed-off-by: Alex Rodionov <p0deje@gmail.com>

Author: treby

rb/lib/selenium/webdriver/chrome/profile.rb

@@ -78,7 +78,7 @@ def as_json(*)
           extensions.concat(@encoded_extensions)
 
           opts = {directory: @directory || layout_on_disk}
-          opts[:extensions] = extensions if extensions
+          opts[:extensions] = extensions if extensions.any?
           opts
         end