'Get all CFGNodes that has an out-degree of 0
:return: A list of CFGNode instances
:rtype:  list'

@property
def deadends(self):

    if (self.graph is None):
        raise AngrCFGError("CFG    hasn't    been    generated    yet.")
    deadends = [i for i in self.graph if (self.graph.out_degree(i) == 0)]
    return deadends
