fix classic function

Author: JohnDuprey

Modules/CIPPCore/Public/GraphHelper/New-ClassicAPIGetRequest.ps1

@@ -18,13 +18,13 @@ function New-ClassicAPIGetRequest($TenantID, $Uri, $Method = 'GET', $Resource =
                     'X-Requested-With'       = 'XMLHttpRequest'
                 }
                 $Data
-                if ($noPagination) { $nextURL = $null } else { $nextURL = $data.NextLink }
+                if ($noPagination -or $null -eq $data.NextLink) { $nextURL = $null } else { $nextURL = $data.NextLink }
             } catch {
                 throw "Failed to make Classic Get Request $_"
             }
-        } until ($null -eq $NextURL)
+        } until ($null -eq $NextURL -or ' ' -eq $NextURL)
         return $ReturnedData
     } else {
         Write-Error 'Not allowed. You cannot manage your own tenant or tenants not under your scope'
     }
-}
+}