Raise exception on reading non-existing file

The validation checks ensure that whatever files are listed in the
control file exist in the zip file bundle. It is still possible,
however, that the code tries to read a file that does not exist in the
file and is not listed in the control file. In those cases, raise the
appropriate exception.

1 files changed, 0 insertions, 0 deletions

diff --git a/tests/r_qtl/test_files/nonexistent.zip b/tests/r_qtl/test_files/nonexistent.zip
new file mode 100644
index 0000000..4a31bf1
--- /dev/null
+++ b/tests/r_qtl/test_files/nonexistent.zip
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