Don't close file stream before EOF, closes #525818

Don't close file stream before EOF, closes #525818

To fix bug #235820 src/list.c was modified to avoid printing
a confusing warning message about a lone zero block. However,
the change also caused the input stream to be closed before
reading EOF which could cause a SIGPIPE to be sent to the
writing process.

In this change, the previous fix is made more narrow to exclude
only the printing of the warning message, but without the side
effect that was causing the SIGPIPE.