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[Po-Hsu Lin <2067978@xxxxxxxxxxxxxxxxxx>]

This happens when calculating the sample standard deviation. When there
is just one result, formula "(len(results) - 1)" will be zero.

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https://bugs.launchpad.net/bugs/2067978

Title:
  ubuntu_performance_multipass failed with "ZeroDivisionError: float
  division by zero"

Status in ubuntu-kernel-tests:
  New

Bug description:
  Test log:
  21:37:38 INFO |     START    ubuntu_performance_multipass.multipassboot    ubuntu_performance_multipass.multipassboot    timestamp=1717105058    timeout=1800    localtime=May 30 21:37:38       
  21:37:38 DEBUG| Persistent state client._record_indent now set to 2
  21:37:38 DEBUG| Persistent state client.unexpected_reboot now set to ('ubuntu_performance_multipass.multipassboot', 'ubuntu_performance_multipass.multipassboot')
  21:37:38 DEBUG| Waiting for pid 5606 for 1800 seconds
  21:37:38 WARNI| System python is too old, crash handling disabled
  21:37:39 INFO | failed to launch
  21:37:39 INFO | failed to launch
  21:37:39 INFO | failed to launch
  21:37:40 INFO | failed to launch
  21:38:57 DEBUG| Running 'multipass list' 
  21:38:58 DEBUG| [stdout] Name                    State             IPv4             Image
  21:38:58 DEBUG| [stdout] test4xenial             Running           10.250.98.194    Ubuntu 16.04 LTS
  21:38:58 DEBUG| Running 'multipass exec test4xenial -- uname -r'
  21:38:58 DEBUG| [stdout] 4.4.0-210-generic
  21:38:58 DEBUG| Running 'multipass exec test4xenial -- systemd-analyze'
  21:38:59 DEBUG| [stdout] Startup finished in 3.839s (kernel) + 29.210s (userspace) = 33.050s
  21:39:02 ERROR| Exception escaping from test:
  Traceback (most recent call last):
    File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
      _call_test_function(self.execute, *p_args, **p_dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 830, in _call_test_function
      raise error.UnhandledTestFail(e)
  UnhandledTestFail: Unhandled ZeroDivisionError: float division by zero
  Traceback (most recent call last):
    File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
      return func(*args, **dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
      postprocess_profiled_run, args, dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
      self.run_once(*args, **dargs)
    File "/home/ubuntu/autotest/client/tests/ubuntu_performance_multipass/ubuntu_performance_multipass.py", line 242, in run_once
      stddev = sqrt(float(reduce(lambda x, y: x + y, map(lambda x: (x - average) ** 2, results))) / (len(results) - 1))
  ZeroDivisionError: float division by zero

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