If so, this is the only molecular compound, that becomes and ionic compound, that becomes a metal. Consider HCl, when frozen, it becomes a solid molecular compound, it doesn't conduct electricity. Or as above, solid NaCl, in water solution, it conducts electricity, but not as a dry solid. Only metals conduct electricity as dry solids, their electrons are delocalized, so are free to conduct electricity.
I think the burden of proof is on your teacher, or perhaps on you because you've mentioned it here, to describe the nature of the solid nitric acid you propose.