misc.sl, directory() and array_map()

["Klaus Schmid" <klaus.schmid@xxxxxx>]

Problems found in in lib/misc.sl, directory():

- If argument is an invalid path (listdir returns NULL)
an error occurs in array_map.

- If there are no files (listdir returns String_Type[0])
an error occurs in array_map.

- Line 109:
      if (is_substr (ch, "[]\\^$+"))
arguments seem to be twisted.

Would it make sense to change the behaviour of
array_map to return a zero-length-array if the argument
is also a zero-length-array?



-- Klaus


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