PLUGINRANGERS-3038 | Prevent false prices + actual bugfix of normalization

[davidmolinacano]

Required by:

• https://github.com/doofinder/support/issues/3038

Actually fixes:

• https://github.com/doofinder/support/issues/3053

This PR prevents prices to be returned as false, so instead, they will be treated as 0, so '' will be returned instead (tested directly on the customer's WP and works):

Apart from this, I have noticed that the fix applied on https://github.com/doofinder/support/issues/3053 was not working as expected, since now the original SE was being retrieved as "no-hash". Now every SE have their hashids correctly assigned:

{
   "store_options":{
      "url":"http:\\/\\/david-wordpress.ngrok.doofinder.com",
      "api_pass":"************************",
      "api_user":"*****",
      "df_token":"************************"
   },
   "platform":"woocommerce",
   "search_engines":{
      "98ed13ef9bb6627cf9cb953437a7a8ce":{
         "lang":"en"
      },
      "331bef2efc54c931693b57cc0075f1dc":{
         "lang":"es"
      }
   }
}

[pedromcp90]

LGTM! 🚀

[davidmolinacano]

Since tomorrow is a bank holiday day, I'm holding until Monday, since the issue has been solved directly on the client side and it's a strange case.