What if beautifulsoups call returns null?

pagelinks = myhtml.findAll('a')

for link in pagelinks:
   do_stuff()
开发者_StackOverflow

If pagelinks is null, will this error out?

How can I make pagelinks a collection of 0 items in case it is null?

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findAll returns an empty list [] when nothing matches

for link in pagelinks:
    do_stuff()  # never executed when findAll returns []