Better handle new installations

cli/Valet/Site.php

@@ -346,6 +346,10 @@ public function unlink(string $name): string
      */
     public function pruneLinks(): void
     {
+        if (! $this->files->isDir(VALET_HOME_PATH)) {
+            return;
+        }
+
         $this->files->ensureDirExists($this->sitesPath(), user());
 
         $this->files->removeBrokenLinksAt($this->sitesPath());

cli/Valet/Upgrader.php

@@ -73,6 +73,10 @@ public function errorIfOldCustomDrivers(): void
     {
         $driversPath = VALET_HOME_PATH.'/Drivers';
 
+        if (!$this->files->isDir($driversPath)) {
+            return;
+        }
+
         foreach ($this->files->scanDir($driversPath) as $driver) {
             if (! str_contains($this->files->get($driversPath.'/'.$driver), 'namespace')) {
                 warning('Please make sure all custom drivers have been upgraded for Valet 4.');