list command fix

src/list.py

@@ -10,6 +10,9 @@ def list_cmd(args):
     check_ground_libs_path()
     
     ground_libs_folder = os.getenv("GROUND_LIBS")
+    
+    folders = []
+    if os.path.isdir(ground_libs_folder): # used to prevent errors that are caused by the GROUND_LIBS folder not existing
         folders = os.listdir(ground_libs_folder)
     
     table = Table("Name", "Version", "Description", title="Installed")