Filter property cannot be empty

[Rick-Jongbloed]

When the filter property is left empty, the script doesn't run. This is fixable by replacing the current code for the query around line 1350 by

	if (-not[String]::IsNullOrEmpty($exchangeMailboxesFilter)) {
		$exchangeQuerySplatParams = @{
			Filter               = $exchangeMailboxesFilter
			Properties           = $properties
			RecipientTypeDetails = "SharedMailbox"
			ResultSize           = "Unlimited"
		}
	} else {
		$exchangeQuerySplatParams = @{
			Properties           = $properties
			RecipientTypeDetails = "SharedMailbox"
			ResultSize           = "Unlimited"
		}
        }