adds missing NPE catch in order to handle rare racing cases #808
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The mentioned NPE case may happen rarely due to racing, thus not always can be reproduced in racing tests (or can be reproduced rarely)
Just observed that case in https://travis-ci.org/github/rsocket/rsocket-java/jobs/681587006
and figured one place which miss NPE catching
Signed-off-by: Oleh Dokuka shadowgun@i.ua