Can I make this meatloaf without the tomato sauce?

I only put ketchup on the Top of the meatloaf, along with raw bacon

eggs will make it lighter in texture with bread crumbs.

sure you can. Not all meatloaf recipes call for sauce in the mix..

I dont ever add tomato sauce, either tomato paste or ketchup

You don't have any condiments that are tomato based?  Barbeque sauce, steak sauce, cocktail sauce?  Nothing?  I've used a bit of soda in hamburgers, you could try that in your meatloaf.  You don't have to have the tomato sauce on the top of your meatloaf.  Some people prefer a brown gravy with theirs.

You could add the tomato paste and maybe a little ketchup?, although the 'paste' is a more concentrated flavour, it would be less 'liquid'.

When I make meatloaf, I add an egg, a squirt of ketchup and maybe a little

worcestershire sauce if I need more moisture added, although I don't use the 'traditional' milk soaked bread, I use breadcrumbs & a little dried sage+onion stuffing mix [its got dried onion, herbs + rusk [which is like bread flakes] to bulk out the meat and add to the taste / texture.

Some cream of mushroom soup would be a good substitute.

You don’t have ketchup? That will work perfectly. 

Take about a tablespoon of the paste and add water to make it up to the 1/2 cup, blend and use