[Bug 2051868] [NEW] Run into error when parsing something as json.

[Kicey Scream]

Public bug reported:

Log from terminal:
~$ update-manager
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py", line 448, in _on_finished
    self._action_done(action,
  File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 365, in _action_done
    self.window_main.start_available()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 241, in start_available
    self.refresh_cache()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 459, in refresh_cache
    self._get_ua_security_status()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 285, in _get_ua_security_status
    s = json.load(p.stdout)
  File "/usr/lib/python3.10/json/__init__.py", line 293, in load
    return loads(fp.read(),
  File "/usr/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2051868

Title:
  Run into error when parsing something as json.

Status in update-manager package in Ubuntu:
  New

Bug description:
  Log from terminal:
  ~$ update-manager
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py", line 448, in _on_finished
      self._action_done(action,
    File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 365, in _action_done
      self.window_main.start_available()
    File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 241, in start_available
      self.refresh_cache()
    File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 459, in refresh_cache
      self._get_ua_security_status()
    File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 285, in _get_ua_security_status
      s = json.load(p.stdout)
    File "/usr/lib/python3.10/json/__init__.py", line 293, in load
      return loads(fp.read(),
    File "/usr/lib/python3.10/json/__init__.py", line 346, in loads
      return _default_decoder.decode(s)
    File "/usr/lib/python3.10/json/decoder.py", line 337, in decode
      obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    File "/usr/lib/python3.10/json/decoder.py", line 355, in raw_decode
      raise JSONDecodeError("Expecting value", s, err.value) from None
  json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

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