[dev] Scry last poll block optimisation

[Chuck Hagenbuch]

Quoting Duck <duck at obala.net>:

>> You should put the poll fetching code into a separate method that uses a
>> static variable instead of a class member to cache the poll, because you
>> can't be sure that _title() gets always called before _content().
>>
>> Jan.
>
> So something like this, I guess.

Committed, thanks.

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams