Ruby 2.7.2 got an error obfuscating empty fields

[yulgolem]

Got this kind of en error: internetee/epp_proxy#44 (comment)

the log output for the error that brought this issue to daylight transformed after the latest ruby update. New error:

FrozenError (can't modify frozen String: ""):
config/initializers/filter_parameter_logging.rb:5:in gsub!' config/initializers/filter_parameter_logging.rb:5:in block (2 levels) in

'
further analysis revealed that this is caused by an & sign in the authifo password for domain transfer.
Eroor 404 is returned to user, the request it self get past web server and proxy and the error seems to be returned from the application.

We should handle & and maybe some other special characters so that the whole query does not break on processing, if possible.