fix loading/storing cookies without domain

gallery_dl/util.py

@@ -289,12 +289,12 @@ def load_cookiestxt(fp):
 
     for line in fp:
 
-        line = line.lstrip()
+        line = line.lstrip(" ")
         # strip '#HttpOnly_'
         if line.startswith("#HttpOnly_"):
             line = line[10:]
         # ignore empty lines and comments
-        if not line or line[0] in ("#", "$"):
+        if not line or line[0] in ("#", "$", "\n"):
             continue
         # strip trailing '\n'
         if line[-1] == "\n":
@@ -326,6 +326,9 @@ def save_cookiestxt(fp, cookies):
     fp.write("# Netscape HTTP Cookie File\n\n")
 
     for cookie in cookies:
+        if not cookie.domain:
+            continue
+
         if cookie.value is None:
             name = ""
             value = cookie.name

test/test_util.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-# Copyright 2015-2021 Mike Fährmann
+# Copyright 2015-2022 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -188,6 +188,10 @@ class TestCookiesTxt(unittest.TestCase):
             ".example.org\tTRUE\t/\tTRUE\t\tname\t",
             [self._cookie("name", "", ".example.org")],
         )
+        _assert(
+            "\tTRUE\t/\tTRUE\t\tname\t",
+            [self._cookie("name", "", "")],
+        )
         _assert(
             "# Netscape HTTP Cookie File\n"
             "\n"
@@ -241,6 +245,8 @@ class TestCookiesTxt(unittest.TestCase):
                     "n4", ""  , "www.example.org", False, "/", False),
                 self._cookie(
                     "n5", "v5", "www.example.org", False, "/path", False, 100),
+                self._cookie(
+                    "n6", "v6", "", False),
             ],
             "# Netscape HTTP Cookie File\n"
             "\n"