In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of s

In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of stream_read,
it will return the empty string if it returned null.

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