A cracked frame alone should not have caused a leak ... check if a seam had came apart, or worse a crack in the glass.
If there is cracked glass, it is prob. not worth replacing as tempered glass costs more than the tank retail. It is possible to redo a tank if it is just a busted seam. It is fairly labor intensive (you have to take the whole tank apart since it is a bottom seam, and put it all back together again) but cost only $5 or so for silicone (from the hardware store). It may be worthwhile if you have lots of time on your hand & enjoy a DIY challenge.
Otherwise, it is a good excuse to upgrade. If you want, you can get a 30 or 40 gal
plastic tub for fairly cheap to house your fish till after the move. This is better than a 7 gal
& should be more stable. <If you have saved your biofilter - ie keep filter & substrate wet - you might be able to move everything to the temp setup & avoid a major cycle.>