Cannot handle read-only html files (possibly regression?) #789
Description
% bash
hosiet@hosiet-mi:~$ export LANG=C
hosiet@hosiet-mi:~$ cat test.html
<!DOCTYPE html>
<html><head><title>hello</title><body></body></html>
hosiet@hosiet-mi:~$ ls -la ./test.html
-r--r--r-- 1 hosiet hosiet 69 Dec 26 12:50 ./test.html
hosiet@hosiet-mi:~$ tidy -ascii -i a.html
Document: "a.html" is not a file!
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