Ignore failed contract creations

mythril/laser/ethereum/svm.py

@@ -122,6 +122,7 @@ class LaserEVM:
             transaction, return_global_state = e.global_state.transaction_stack.pop()
 
             if return_global_state is None:
+                if not isinstance(transaction, ContractCreationTransaction) or transaction.return_data:
                     e.global_state.world_state.node = global_state.node
                     self.open_states.append(e.global_state.world_state)
                 new_global_states = []