/usr/share/texmf-texlive/metapost/misc/null.mp is in texlive-metapost 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | % This is an empty MetaPost source file. Why do you want it? Because if
% mp says `Please type another input file name:' and if you don't have one
% in mind, you can just say `null' and MetaPost will get out of its loop.
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