The customer order view is not working with a "+" in email addresses.

to reproduce:

• order something with an email address that has a "+" in it
• try to view customer on admin page

workaround:
https://github.com/ezsystems/ezpublish-legacy/pull/1199

it's just a workaround, the real problem seems to be that it isn't possible to get a "+" across $Params.