Merge pull request #224 from Its-Just-Nans/check-dir

Check dir before listing - handle NotADirectoryError

rshell/main.py

@@ -830,6 +830,8 @@ def listdir_matches(match):
             # This can happen when a symlink points to a non-existant file.
             pass
         return filename
+    if not os.path.isdir(dirname):
+        return []
     matches = [add_suffix_if_dir(result_prefix + filename)
                for filename in os.listdir(dirname) if filename.startswith(match_prefix)]
     return matches