check_megacli.py crashes when parsing output of `megacli`

[Edin S]

check_megacli.py crashes when parsing the contents of /var/lib/nagios/megacli.out (attached). The crash traceback is as follows :

/usr/local/lib/nagios/plugins/check_megacli.py
<function parse_output at 0x7fc36a0410d0> raised unknown exception '<class 'TypeError'>'
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Traceback (most recent call last):
  File "/usr/local/lib/nagios/plugins/nagios_plugin3.py", line 32, in try_check
    function(*args, **kwargs)
  File "/usr/local/lib/nagios/plugins/check_megacli.py", line 90, in parse_output
    for cnt in ('failed_ld', 'wrg_policy_ld') if vars()['cnt'] > 0
  File "/usr/local/lib/nagios/plugins/check_megacli.py", line 90, in <listcomp>
    for cnt in ('failed_ld', 'wrg_policy_ld') if vars()['cnt'] > 0
TypeError: unorderable types: str() > int()
============================================================

This error was triggered when a physical disk died.

[Alvaro Uria (aluria)]

Fix released at cs:~nagios-charmers/hw-health-15