[BUG] NPC can be left behind

[adweex]

Describe the bug
Once you reach the npc pickup location you can only press E and leave the npc behind.

To Reproduce
Steps to reproduce the behavior:

1. start an NPC mission
2. Go to the pickup location
3. Press E but drive away.

Expected behavior
Taxi should be frozen while npc is not in the car (check for the npc health. Things could happen)
OR
Interrupt the mission if the npc gets too far away from the car.

Screenshots
Poor guy gave up eventually