Werk #6409: wmi.include: don't throw exepctions in the parse function

In previous versions the parse function provided in wmi.include (used in different WMI checks like e.g. wmi_cpuload) raised a MKCounterWrapped exception if a WMI timeout occured. This leads to a crash during the service discovery when a timeout occurs.

Now the parse function always returns valid data. If a timeout occurs an empty table is added to the parsed data. The inventory function can then easily check for empty tables. If on the other hand the check function tries to access an empty table a MKCounterWrapped exception is raised.

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