fix load settings in Flatpak

src/settings/tools/yml_tools.py

@@ -11,9 +11,11 @@ def get_module_directory():
 
 def load_modules():
     modules = []
+    all_modules = set()
     local_modules_directory = get_local_module_directory()
     global_modules_directory = get_module_directory()
 
+    if os.path.isdir(global_modules_directory):
         all_modules = set(os.listdir(global_modules_directory))
 
     for module_name in os.listdir(local_modules_directory):
@@ -22,6 +24,7 @@ def load_modules():
             modules += load_yaml_files_from_directory(module_path)
             all_modules.discard(module_name)
 
+    if all_modules:
         for module_name in all_modules:
             module_path = os.path.join(global_modules_directory, module_name)
             if os.path.isdir(module_path):