Sadly, I don’t have a clean project anymore (haven’t tested on one, either), but this occurs after changing the player/AI meshes and the other stuff I’ve mentioned above (pistol being the only changed weapon, that is). The errors are like
Info The execution path doesn't end with a return node. then
Info The execution path doesn't end with a return node. else
… and they appear all over the blueprint. There’s way too many of them for me to specifically list at the moment, though :\
But the blueprint compiles without any other errors, so there’s that green OK sign on top of the “Compile” button.