You are able to move angles from one animation to another. However there are a couple of problems with this:
1) An angle will still transfer even if the target animation has one of the same value.
2) The last angle of an animation will still transfer if that animation has any sub-animations. This means you can get animations without any angles at all.
To test both of these:
- Create a new direct X app
- Make a sprite object and select it in the layout editor
- In the animation window create a sub-animation for the default one.
- Move the default's angle into the newly created sub-animation
- Delete the sub-animation. Now only default is left with no angle
- Run the app
- Kaboom.
I've uploaded a .cap file but you can really do this with any sprite.