Bug #263 complains about test -t (i.e. without the optional file 
descriptor argument) causes a syntax error.

This bug was introduced when code was added to check to make sure that 
unary operators had an argument.  Unfortunately, the case where the 
argument is optional was overlooked.

Unless someone is going to fix this before 1.0, I suggest that we revert 
to the previous version.  In that version, it failed when given improper
arguments; now it can fail when given valid arguments.  I think the 
latter case is worse than the former.

	--jtc


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