Bug: Submit task asynchronously

[YunJ1e]

Bug Description:
Following docs code on Submit task asynchronously will not give the proper output

Code to Reproduce the Bug:
The code is from the documentation website.

import numpy as np
from quafu import QuantumCircuit, Task
task = Task()
task.config(backend="ScQ-P10", shots=2000, compile=False, priority=2)

ts = range(0, 5, 1)
names = ["%dus" %t for t in ts]
for name, t in zip(names, ts): 
    q = QuantumCircuit(3)
    q.x(2)
    q.delay(2, t, unit="us")
    q.measure([2])
    res = task.send(q, wait=False, name=name, group="Q3_T1")

group_res = task.retrieve_group("Q3_T1")
probs = [res.probabilities["1"] for res in group_res]

Code Output:

AttributeError: 'NoneType' object has no attribute 'values'

Those tasks are indeed uploaded to the cloud and could be seen on the website. But it seems like something goes wrong with the task.retrieve_group("Q3_T1")

My Debugging Trials:

ts = range(0, 5, 1)
names = ["%dus" %t for t in ts]
result = []
for name, t in zip(names, ts): 
    q = QuantumCircuit(3)
    q.x(2)
    q.delay(2, t, unit="us")
    q.measure([2])
    task = Task()
    task.config(backend="ScQ-P10", shots=2000, compile=False)
    result.append(task.send(q, name=name))

will do the job similarly, but it is not asynchronous I guess.

[Zhaoyilunnn]

We incorporate a patch at pyquafu side to fix this issue. Thanks.

Before we release new version, you could try to build from stable/0.3 branch.