Don't default all directories to DownloadPath if empty

qutebrowser/browser/downloads.py

@@ -24,7 +24,7 @@ import os.path
 from functools import partial
 from collections import deque
 
-from PyQt5.QtCore import pyqtSlot, pyqtSignal, QObject, QTimer
+from PyQt5.QtCore import pyqtSlot, pyqtSignal, QObject, QTimer, QStandardPaths
 from PyQt5.QtNetwork import QNetworkRequest, QNetworkReply
 
 import qutebrowser.config.config as config
@@ -211,6 +211,9 @@ class DownloadItem(QObject):
             target = os.path.expanduser(filename)
         else:
             download_dir = config.get('storage', 'download-directory')
+            if download_dir is None:
+                download_dir = get_standard_dir(
+                    QStandardPaths.DownloadLocation)
             target = os.path.join(download_dir, filename)
         logger.debug("Setting filename to {}".format(filename))
         if self.filename is not None:

qutebrowser/config/conftypes.py

@@ -24,7 +24,7 @@ import shlex
 import os.path
 from sre_constants import error as RegexError
 
-from PyQt5.QtCore import QUrl, QStandardPaths
+from PyQt5.QtCore import QUrl
 from PyQt5.QtGui import QColor, QFont
 from PyQt5.QtNetwork import QNetworkProxy
 
@@ -800,7 +800,7 @@ class Directory(BaseType):
 
     def transform(self, value):
         if not value:
-            return get_standard_dir(QStandardPaths.DownloadLocation)
+            return None
         return os.path.expanduser(value)