Invoke-JiraIssueTransition error (same as issue #42)

[colhal]

Calling Invoke-JiraIssueTransition updates the Jira issue status but also returns the following error:
ERROR:
ConvertFrom-Json2 : Cannot bind argument to parameter 'InputObject' because it is an empty string.
At C:\Users\chalford\Documents\WindowsPowerShell\Modules\PSJira\1.2.5.112\Internal\Invoke-JiraMethod.ps1:93 char:54
$result = ConvertFrom-Json2 -InputObject $webResponse.Content