Strip illegal xml chars from webservice response

[francas]

If Web service response contains illegal xml chars, parser fails. This PR adds regex of illegal xml chars to Webservice class and uses it for parsing.

[pedrobaeza]

Why the webservice will return illegal chars?

[francas]

Why the webservice will return illegal chars?

In our case it was just a matter of having one of the chars '\x0b' in a product description.

[pedrobaeza]

Yeah, but then ignoring it it's not the best solution, or at least not the best place to do it. It should be Prestashop who strips it before sending, isn't it?

[francas]

Well, it depends. We can control the parsing end (and this makes the parser more resilient) or we can expect PS to fix it. As we needed fix here and now we implemented this in parsing, instead of waiting for PS to fix this on their end.

Just wanted to share this solution in case it was useful.

[pedrobaeza]

Yeah, thanks for sharing. My only fear is that we don't have the exact same information in one side or the other, so there's the risk of altering information in syncing back without that characters.

@guewen what do you think about this?