<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def prj_add_atype(self, *args, **kwargs):
 """Add more assettypes to the project. :returns: None :rtype: None :raises: None """

        if not self.cur_prj:
            return
        dialog = AtypeAdderDialog(project=self.cur_prj)
        dialog.exec_()
        atypes = dialog.atypes
        for atype in atypes:
            atypedata = djitemdata.AtypeItemData(atype)
            treemodel.TreeItem(atypedata, self.prj_atype_model.root)