No, don't leave it. It will eventually fail and possibly fail big time. They can be professionally repaired of course but it'll never be the same. I had one repaired years ago and it was a very good job, but eventually a crack appeared right next to the new weld. I weighed it in with my next lot of aluminium scrap and got a new one. Oh, and a crack in the rim is also an MOT failure.
Don't risk it!