fix load settings in Flatpak

src/settings/tools/yml_tools.py

@@ -11,10 +11,12 @@ def get_module_directory():
 
 def load_modules():
     modules = []
+    all_modules = set()
     local_modules_directory = get_local_module_directory()
     global_modules_directory = get_module_directory()
 
-    all_modules = set(os.listdir(global_modules_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):
         module_path = os.path.join(local_modules_directory, module_name)
@@ -22,10 +24,11 @@ def load_modules():
             modules += load_yaml_files_from_directory(module_path)
             all_modules.discard(module_name)
 
-    for module_name in all_modules:
-        module_path = os.path.join(global_modules_directory, module_name)
-        if os.path.isdir(module_path):
-            modules += load_yaml_files_from_directory(module_path)
+    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):
+                modules += load_yaml_files_from_directory(module_path)
 
     return modules