[erlang-bugs] etop dies with unmatched case_clause error

[Igor Goryachev]

Hello.

etop sometimes dies with the following output:

Output server crashed: {{case_clause,undefined},
                        [{observer_backend,pi,2},
                         {observer_backend,'-etop_collect/1-fun-0-',1},
                         {lists,flatmap,2},
                         {lists,flatmap,2},
                         {observer_backend,etop_collect,1}]}

There seems to be a missed case clause in pi/2 of observer_backend while
process_info can return more values than is handled, from manual page:
``process_info(Pid, Item) -> {Item, Info} | undefined | [])''. The
tiny patch is included.

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-- 
Igor Goryachev
Yandex development team.