fixed symlink dir not being fetched

I can't believe this was the issue...

.env.defaults

@@ -1,4 +1,4 @@
 PORT = 8000
 GRAB_SYMLINKS = true
-SYMLINKS_DIR = "symlinks"
+SYMLINK_DIR = "symlinks"
 STATIC_SHARE_RESTRICTION = true

serve.py

@@ -31,7 +31,7 @@ def get_project_directory(project_id):
     if GRAB_SYMLINKS and not os.path.exists(project_dir):
         # If the project does not exist in the projects dir, check if it exists in the symlinks dir
         if not os.path.exists(SYMLINK_DIR) or not os.path.isdir(SYMLINK_DIR):
-            return None
+            return ""
         # Find the symlink directory that starts with the project_id
         symlink_dirs = [d for d in os.listdir(SYMLINK_DIR) if os.path.isdir(os.path.join(SYMLINK_DIR, d))]
         # Sort by last modified time (descending)