inkscape config path fallback (#1554)

lib/utils/inkscape.py

@@ -4,14 +4,21 @@
 # Licensed under the GNU GPL version 3.0 or later.  See the file LICENSE for details.
 
 import sys
-from os.path import expanduser, split
+from os.path import expanduser, realpath, split
 
 from inkex.utils import get_user_directory
 
 
 def guess_inkscape_config_path():
     if getattr(sys, 'frozen', None):
-        path = split(get_user_directory())[0]
+        if get_user_directory() is not None:
+            path = split(get_user_directory())[0]
+        else:
+            path = realpath(sys._MEIPASS.split('extensions', 1)[0])
+            if sys.platform == "win32":
+                import win32api
+                # This expands ugly things like EXTENS~1
+                path = win32api.GetLongPathName(path)
     else:
         path = expanduser("~/.config/inkscape")
     return path