[s1956] Fix a mistake from [s1954]

There was a glitch in the rare case of a valid map which had no areatrigger_teleport possibility to be teleport upon.

Also improve some DBError strings (thanks to crackm for pointing)

(based on commit [12435] - bb9df78)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>