Runtime checker might break with CalledProcessError

[ewerybody]

I received some log lines with an error from the runtime checker:

File "a2ui.py", line 657, in run
File "a2runtime.py", line 492, in is_runtime_live
File "a2runtime.py", line 473, in get_a2_runtime_pid
File "subprocess.py", line 420, in check_output
File "subprocess.py", line 524, in run
subprocess
CalledProcessError
Command 'wmic process where name="autohotkey.exe" get ProcessID,CommandLine' returned non-zero exit status 2147749938.

Would be nice to be able to reproduce and solve it.