Anything that disturbs the surface tension of tempered glass is an explosion of glass gravel waiting to happen. If the scratch happens to penetrate all the way through the hardened surface, it can be a starting point for a catastrophic failure. Definitely let a pro check it out before you try to install it.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!