Cannabis is glutton. She loves nitrogen during her vegitative growth state, I don't see how denying her this would be ok.
Your plant will probably survive and even probably have a yield, but it'll be small and not as potent as it couldve been.
No man, molasses arent gonna be enough. You need a growth nute. One with nitrogen for growth. Tiger bloom is a bloom nute isnt it? Idk, i think you need some veg nutes.
Follow the Fox Farm feeding schedule if you want to use nutes! It is pretty much fail proof! Or start with a good organic mix and then you can just water and add the molasses towards the end!