[R] List elements of NULL to value

[LCOG1]

Hi everyone, 
    I am posting this because i know its easy and i cant for the life of me
figure out how to do it though i have tried and through a ridiculously
complex loop made it happen.  I need to convert some list elements of NULL
value to 0s so they mesh with my data frame properly.  So for 

A<-list(1,NULL)

returns

[[1]]
[1] 1

[[2]]
NULL

Would instead return

[[1]]
[1] 1

[[2]]
[1] 0

The nabble posts seem to indicate dealing with NULLs can be tricky so i am
attributing my lack of success to that, mainly so i can live with myself and
asking the list such a simple question.  Sorry again guys.

JR
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