You don't use up the hydrogen in operation, so you don't need to create it on the vehicle. Attempting to do so would just add weight and probably wouldn't work anyway as I suspect the amount of energy you would require to convert water into hydrogen is a lot more than a few solar panels could ever provide.

The issue is hydrogen is just inherently dangerous. Compounded by the fact that no one really cares anyway because airships don't have a purpose to exist in the modern world outside of a very few niche scenarios.