[VNET] unaccurate exception from db.open methode

[SoftIl]

Hi Ruslan,
if I try to open an database I get inaccurate exception return in case of
the db isn't available.
Could be the db doesn't exist or the db is in use by an other programm, for
example.
In every case I get always the same exception "VNET.VException" with an
empty exception message string return.
That isn't really good.
It is impossible to find out for me, why I couldn't open the db.

Please can you change this?

Best regards,
Carsten