[imapfilter-devel] return empty array instead nill

[Jan Lana]

Hi,

fetchfields, fetchheaders, ... functions return 'nil' if the messages
array is empty. Much better is to return empty array '{}' because it
allows constructions like

for i,v in pairs(fetchfields(... match(...))) do

pairs() fails on nil argument, so now I have to store the fetchfields()
result to a variable and test it first.

A simple patch is attached.

regards,
- jenda
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