Okay, to answer your question: it's fine if you don't eat a big dinner.
BUT!!!!!
It is
NOT FINE if that leaves you 10 points shy. You must, must, must eat all your Points. You can get your Points in with a bigger breakfast...get some dairy in with yogurt in the morning, maybe...try a spoonful of peanut butter with your banana to get healthy fats in...Green Giant has fantastic frozen veggies with a low-fat cheese sauce, just throw them in the microwave and count 1 point (per serving) for the cheese sauce...salads need to go back into your diet, you need your veggies! I love chicken enchiladas suiza, I often have that for breakfast (yogurt and unsweetened applesauce 2 hours later, 2T of peanut butter and a banana 2 hours later, salad and protein 2 hours later...etc), but it's not veggie-based.
Your body needs these things to function properly. The snack cakes and the bottle of tea (if it's not sugar free) come
after you get all of your essentials in. I can't stress this enough. Put those extra Points whereever you want them, but you
must eat them all!
Now that I've gone a bit preacherish

, I'll address another question. Occasionally missing a meal--because you were just too exhausted to eat and went right to bed, because (like me, today) you can't swallow due to an inflamed throat (I can barely get
water down), because your stomach is upset and anything would come right back up--that's okay. Starvation response doesn't kick in that fast. If it's a habit, though, then it's worrisome, and needs to be addressed.