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
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