_analyse_function_features(): Skip empty functions. (#929)
_analyse_function_features(): Skip empty functions. (#929)

We used to always mark empty functions as returning, which is an incorrect behavior.
angr/angr,iamahuman/angr,iamahuman/angr,tyb0807/angr,tyb0807/angr,schieb/angr,schieb/angr,schieb/angr,angr/angr,iamahuman/angr,angr/angr,tyb0807/angr