r1994: small bug: public service line information button

[isidoro]

When public service is active, one can open the lines information button.  There, one can create a new line for the public service provided a vehicle type tab is selected first.  I suppose that that is not right since that line cannot be populated with vehicles.

[prissi]

Ok, that should be fixed.

[isidoro]

Thanx, Prissi.