Handle incomplete response (e.g. missing Body or ProbeMatches elements) #60
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which causes a NullReferenceException
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When XML deserialization returns incomplete data, this cause a NullReferenceException that can be seen below log lines.
`
System.NullReferenceException: Object reference not set to an instance of an object.
at Onvif.Core.Discovery.WSDiscovery.d__7.MoveNext()
at Onvif.Core.Discovery.WSDiscovery.d__5.MoveNext()
at System.Collections.Generic.List1.InsertRange(Int32 index, IEnumerable1 collection)
at Onvif.Core.Discovery.WSDiscovery.d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
`