Fixes after rebase

Author: kocsismate

ext/uri/tests/whatwg/parsing/password_success_empty.phpt

@@ -16,7 +16,7 @@ object(Uri\WhatWg\Url)#%d (%d) {
   ["username"]=>
   string(4) "user"
   ["password"]=>
-  NULL
+  string(0) ""
   ["host"]=>
   string(11) "example.com"
   ["port"]=>

ext/uri/tests/whatwg/parsing/username_success_empty.phpt

@@ -14,7 +14,7 @@ object(Uri\WhatWg\Url)#%d (%d) {
   ["scheme"]=>
   string(5) "https"
   ["username"]=>
-  NULL
+  string(0) ""
   ["password"]=>
   string(4) "pass"
   ["host"]=>

ext/uri/tests/whatwg/parsing/username_success_extended_ascii.phpt

@@ -16,7 +16,7 @@ object(Uri\WhatWg\Url)#%d (%d) {
   ["username"]=>
   string(14) "%C3%BAz%C3%B6r"
   ["password"]=>
-  NULL
+  string(0) ""
   ["host"]=>
   string(11) "example.com"
   ["port"]=>