Check if null

[vitoyucepi]

I've found two ways to check if variable is null.

1. null.defined: test whether a value is null or not

   liquidsoap/libs/metadata.liq

   Line 149 in 801625b

   if null.defined(c) then

2. compare with null()

   liquidsoap/tests/streams/say.liq

   Line 6 in 801625b

   if file.which(null.get(settings.protocol.gtts.path())) == null() and file.which(null.get(settings.protocol.text2wave.path())) == null() then

Which method is better?

[smimram]

Both ways should be equivalent.