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I'd read somewhere that pushing too hard means you'll just burn through any residual stored glycogen and whatnot and then just munch through your lovely muscles - and like @hippy says going too long or hard when fasted could make you ill. But i don't know if taht counts when less than an hour?
Also, i reckon riding in that 'sweetspot' area, which is hard but kind of not hard, should be ok as it's not super intense? I wouldn't fancy doing short and brutal intervals with nothing in the tank
Like you @SCS, i just smash down a banana and whey smoothie after an early session then ride too work (only 25 mins), before my bucket of porridge.
Why would you not push too hard when training fasted...especially if you're only doing up to an hour or so? I do virtually all my training first thing in the morning, and then cycle to work before having breakfast! Would it not also be the case that training in the morning after having had a decent dinner the night before isn't quite the same as training fasted?
TL;DR I've no answers for you, only questions!