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20243132fb
This tries to open the given file to use as stdin, and if it fails, for any reason, it uses /dev/null instead. This is useful in cases where we would otherwise do either of these: ```fish test -r /path/to/file and string match foo < /path/to/file cat /path/to/file 2>/dev/null | string match foo ``` This both makes it nicer and shorter, *and* helps with TOCTTOU - what if the file is removed/changed after the check? The reason for reading /dev/null instead of a closed fd is that a closed fd will often cause an error. In case opening /dev/null fails, it still skips the command. That's really a last resort for when the operating system has turned out to be a platypus and not a unix. Fixes #4865 (cherry picked from commit df8b9b70954fd38c170b954967112d50ba299223)