I agree with emma, but I would add that you could dose the empty tank with ammonia to maintain the biological filter while there are no fish present. This would avoid having to cycle from scratch, essentially you are keeping the cycle going instead.
If I was just waiting before restocking the tank as it is, then I too would go the ammonia route to keep the tank 'ticking over' until the new stock were in...
I actually want to completely empty the tank and start again with a new 'fishless cycle'/substrate/decor etc. for a completely different species of fish (Dwarf Cichlids instead of a 'tropical community')... I just want to put one nice, established Vallis and some floating amazon frogbit plants from the 'original' ich-infested set up into the 'new' set up...
So I can empty the tank of everything... put in my new substrate, decor and 'old' plants, filter and heater... then do a 'fishless' cycle... the plants ill keep growing... and any remaining 'ich' on plants/filter/heater will die over the 3 to 4 weeks the cycling will take - as their are no fish in there... correct?!... thanks