my 7th, 8th, and 9th houses are completely void of anything on my birth chart. no planets, no aspects, just empty. is that normal does every one have some empty houses? if some do and some do not then what does that mean to have a empty house or houses?

my 7th, 8th, and 9th houses are completely void of anything on my birth chart. no planets, no aspects, just empty. is that normal does every one have some empty houses? if some do and some do not then what does that mean to have a empty house or houses?