Do worries OP. The glass used for shower doors are made to shatter. If it shattered, that means normal glass would've broken into larger chunks that could fall on someone and do some real damage. They're built to shatter as a safety feature, because the small bits normally wont do more damage than some light scratches if they hit you.

The cost to fix can suck, but if it was warped/stuck it was going to happen to the next person who tried to move it.