SUP-39098 : Fix address comparison in _areSameAdresses

[dmshd]

This fixes the following error.
I did it in pair @daggelpop and I reproduced the same problem with the same data locally and our code seems to resolve the problem.
Problem was if street_a was empty (tenant had no address set in the "cadastre", the tace was generated and the tenants where not properly created. See https://support.imio.be/browse/SUP-39098 for more info.

<155>Sep 19 13:25:59 urban007 zope[2243328]: lalouviere_urb25 instance2 [ERROR] Zope.SiteErrorLog | 1726745159.670.781332659531 https://lalouviere-urban.imio-app.be/urban/codt_urbancertificateones/codt_urbancertificateones/codt_urbancertificateone.2024-09-19.7151418318/searchparcels
Traceback (innermost last):
  Module ZPublisher.Publish, line 138, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 48, in call_object
  Module Products.urban.browser.searchparcelsview, line 74, in __call__
  Module Products.urban.browser.searchparcelsview, line 197, in createParcelAndProprietary
  Module Products.urban.browser.searchparcelsview, line 248, in createApplicantFromParcel
  Module Products.urban.browser.searchparcelsview, line 283, in _areSameAdresses
TypeError: ratio expected two Strings or two Unicodes