dmiller 930bc91359 Modify stdnse.output_table to handle empty values better ...

Two changes here, both minor. First, explicitly assigning a new key to
nil does not add the key to the ordered set of keys. This better
emulates the behavior of regular tables.

> o = stdnse.output_table()
> o["test"] = nil

This previously resulted in output like this:

|_ test: nil

Now it simply omits the "test:" key.

Second, I needed a way to tell whether an output table was empty or not.
Since Lua's next() function doesn't call the __pairs metamethod, it was
always returning nil. Instead, I used the __call metamethod, since it
had the least preexisting semantic meaning:

> o = stdnse.output_table()
> =o()
false
> o["test"] = 1
> =o()
true

2013-05-06 18:39:54 +00:00

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