fix filters

Author: JohnDuprey

Modules/CIPPCore/Public/Entrypoints/Invoke-ListLogs.ps1

@@ -27,7 +27,7 @@ function Invoke-ListLogs {
         if ($request.Query.Filter -eq 'True') {
             $LogLevel = if ($Request.Query.Severity) { ($Request.query.Severity).split(',') } else { 'Info', 'Warn', 'Error', 'Critical', 'Alert' }
             $PartitionKey = $Request.Query.DateFilter
-            $username = $Request.Query.User
+            $username = $Request.Query.User ?? '*'
 
             $StartDate = $Request.Query.StartDate ?? $Request.Query.DateFilter
             $EndDate = $Request.Query.EndDate ?? $Request.Query.DateFilter