/usr/share/texmf-texlive/metafont/base/null.mf is in texlive-base 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 METAFONT source file. Why do you want it? Because if
% mf says `Please type another input file name:' and if you don't have one
% in mind, you can just say `null' and METAFONT will get out of its loop.
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