BLCC#38231 sso=0 weer correct ondersteunen

svn path=/Website/branches/v2016.2/; revision=31239

APPL/Shared/loginTry.asp

@@ -208,9 +208,9 @@ if (user_key < 0 && jwt)
     }
 }
 
-if (user_key < 0 && getQParam("sso", ""))
+var sso = getQParam("sso", "");
+if (user_key < 0 && sso && sso != "0") // "0" is een hardcoded special case
 {
-    var sso = getQParam("sso");
     var sql = "SELECT *"
             + "  FROM fac_idp"
             + " WHERE fac_idp_code = " + safe.quoted_sql(sso);