Fix post-processing crash when using empty category folders.

sabnzbd/misc.py

@@ -315,6 +315,7 @@ def real_path(loc, path):
         path = path.strip()
     else:
         path = ''
+    if path:
         if path.startswith('~'):
             path = path.replace('~', sabnzbd.DIR_HOME+'/', 1)
         if sabnzbd.WIN32:
@@ -322,6 +323,8 @@ def real_path(loc, path):
                 path = os.path.join(loc, path)
         elif path[0] != '/':
             path = os.path.join(loc, path)
+    else:
+        path = loc
 
     return os.path.normpath(os.path.abspath(path))