small patch for tv

[Dmitriy Budashny]

Hi  there
I've found some strange issue with tv while using stumpwm. tv was crashing
while I was trying to load some table, so I got such output to my console:
### log begins here ###
=ERROR REPORT==== 22-Oct-2009::16:31:05 ===
Error in process <0.571.0> with exit value:
{function_clause,[{lists,nthtail,[6,[]]},{tv_pg_gridfcns,resize_grid,3},{tv_pg,loop,1}]}

Internal error... restarting.
10>
=ERROR REPORT==== 22-Oct-2009::16:31:06 ===
Error in process <0.578.0> with exit value:
{function_clause,[{lists,nthtail,[6,[]]},{tv_pg_gridfcns,resize_grid,3},{tv_pg,loop,1}]}

Internal error... restarting.
### log ends here ###

So it continued restarting over and over again. The problem was with call to
lists:nthtail(6,[]) which raised exception:
** exception error: no function clause matching lists:nthtail(6,[])
So I've made small changes to tv_pg_gridfcns.erl file. Patch attached.

-- 
wbr, dym
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