`inspector.show()` blocks when used from Conda

[randomir]

Few users reported they have issues when using the inspector installed with Conda.

They report inspector.show() blocks until manually interrupted:

File "/home/.../anaconda3/.../lib/python3.7/site-packages/dwave/inspector/__init__.py", line 180, in show
    return open_problem(id_, block=block)
File "/home/.../anaconda3/.../lib/python3.7/site-packages/dwave/inspector/__init__.py", line 94, in open_problem
    app_server.wait_problem_accessed(problem_id)
File "/home/.../anaconda3/.../lib/python3.7/site-packages/dwave/inspector/server.py", line 198, in wait_problem_accessed
    problem_access_sem[problem_id].acquire(blocking=True, timeout=timeout)
File "/home/.../anaconda3/.../lib/python3.7/threading.py", line 427, in acquire
    self._cond.wait(timeout)
File "/home/.../anaconda3/.../lib/python3.7/threading.py", line 296, in wait
    waiter.acquire()
KeyboardInterrupt