You shouldn't run your water heater empty; on electric or gas.
Yet, based on what you are saying, it sounds like you may be confused a bit. If both your electric and gas toggle switches are turned off, the water heater will not run.
If you are wanting to run your furnace heater, then the answer is, go ahead and run it. Just be aware, it uses a lot of propane. I assume you are plugged in to shore power, so draining batteries is not an issue.
Though, since you have not winterized it yet but as you say, you have emptied the tanks, I highly recommend you open the low point drains and drain all the lines, and/or blow the lines out.
Yet, in the end, the time you will spend, opening the propane tanks and turning on the heat inside and draining the lines at the low point drains, you may as well take the 15 minutes and winterize it by pumping the pink stuff in the lines and dumping some in the traps, etc.
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