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Believe it or not, the purpose of the felt is to protect the sheathing and the rest of the house during construction until the shingles are laid. It's also used to do the SAME protection should the shingles get blown off during a storm, or something. What I'm trying to say is: Cracked or 'missing' felt in your situation shouldn't be a big deal.
Again, believe it or not, many, MANY roofers don't even use felt if the shingles are going on the sheathing right away. That's right! Depending, this is what some do. In your situation, if you don't have to wait too many days for the felt to warm up a bit, that's what I'd do. Most importantly, you do want the felt to lay as flat as possible. A warm sun will help you w/that. Also, if there are 'bubbles' or bumps in the felt, and you go to put the shingles on, the shingles won't lay flat. If there's a good wind BEFORE the roof has a chance to warm up, the shingles may get blown off.
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!