[Bugfix] Capture null speedtest server default to prevent the error (alexjustesen#793)

Author: alexjustesen

app/Filament/Pages/Settings/GeneralPage.php

@@ -102,6 +102,10 @@ public function form(Form $form): Form
 
     protected function getServerLabels(array $values): array
     {
+        if (count($values) && is_null($values[0])) {
+            return [];
+        }
+
         return collect($values)->mapWithKeys(function (string $item, int $key) {
             return [$item => $item];
         })->toArray();