Pywbem 0.7.0 and higher verifies SSL certificates by default, which creates problems for the script when Pywbem is updated. no_verification=True argument is hard-coded.
Andreas Gottwald sent a patch which fixes an issue, when the CIM element was a "NoneType" element but the plugin wanted to read a string from it.
Traceback (most recent call last):
File "./check_esxi_hardware.py", line 629, in <module>
verboseoutput(" Element Name = "+elementName)
TypeError: cannot concatenate 'str' and 'NoneType' objects
The change for the chassis serial number was already prepared a few months ago but I only found time today to do the merge and the release. Therefore adapting the date in history and version variable to today (20150109)