[11730] Move empty guid check into GetPlayerAccountIdByGUID code.

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автор: VladimirMangos


<pre>m src/game/AuctionHouseHandler.cpp
m src/game/AuctionHouseMgr.cpp
m src/game/MailHandler.cpp
m src/game/ObjectMgr.cpp
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[11730] Move empty guid check into GetPlayerAccountIdByGUID code.

This cleanup small code and let catch some missing check cases
when 0 guid attempt searched by real DB query.

This also make function call more safe if it used with non-player guid by
some reason.</pre>




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