[S] Make table.pack error on nil values to reduce complaints

["Soni L." <fakedme@...>]

Make it so if table.pack is given a nil value, it errors, in order to 
reduce complaints.

We already have select(). Making table.pack() error if given a nil value 
will cause people to switch to select(), thus reducing complaints about 
table.pack and holes.

Then, they can use something like the following, instead of complaining:

local function simplepack(...) return {n=select('#',...), ...} end
local function fancypack(...) local len = select('#', ...) return 
setmetatable({...}, {__len=function() return len end}) end

This will help reduce complaints.

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