Don't require status_id or model_id when updating asset

SnipeitPS/Public/Set-Asset.ps1

@@ -59,11 +59,13 @@ function Set-Asset()
         [hashtable] $customfields
     )
 
-    $Values = @{
-        "name"      = $Name
-        "status_id" = $status_id
-        "model_id"  = $model_id
-    }
+    $Values = @{}
+
+    if ($Name) { $Values.Add('name',$Name)}
+
+    if ($status_id) { $Values.Add('status_id',$status_id)}
+
+    if ($model_id) { $Values.Add('model_id',$model_id)}
        
     if ($customfields)
     {