Get-NSXSegementIdRange throws an error if no segment range exists

[sammcgeown]

Running "get-nsxsegmentidrange" with no segment ID defined throws an error

 PS E:\SCRIPTS\NSX-Deploy> Get-NsxSegmentIdRange
 The property 'segmentRange' cannot be found on this object. Verify that the property exists.
 At C:\Users\sam\Documents\WindowsPowerShell\Modules\PowerNSX\PowerNSX.psm1:8962 char:27
 +                 Default { $response.segmentRanges.segmentRange }
 +                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     + CategoryInfo          : NotSpecified: (:) [], PropertyNotFoundException
     + FullyQualifiedErrorId : PropertyNotFoundStrict

[nmbradford]

fixed in #471 thanks @sammcgeown