fix: Filter out directives with None or empty names from UI

- Add validation in Devices.frontend() to exclude directives with null/empty names
- Add validation in Devices.directive_names() to exclude invalid directive names
- Prevents 'None' from appearing as an option in query type dropdown
- Ensures only valid directives with proper names are exposed to frontend
- Improves UI cleanliness and prevents user confusion

Author: WilhelmZA

hyperglass/models/config/devices.py

@@ -344,7 +344,10 @@ def directive_plugins(self: "Devices") -> t.Dict[Path, t.Tuple[str]]:
 
     def directive_names(self) -> t.List[str]:
         """Get all directive names for all devices."""
-        return list({directive.name for device in self for directive in device.directives})
+        return list({
+            directive.name for device in self for directive in device.directives
+            if directive.name is not None and directive.name.strip() != ""
+        })
 
     def frontend(self: "Devices") -> t.List[t.Dict[str, t.Any]]:
         """Export grouped devices for UIParameters."""
@@ -361,7 +364,10 @@ def frontend(self: "Devices") -> t.List[t.Dict[str, t.Any]]:
                             f"/images/{device.avatar.name}" if device.avatar is not None else None
                         ),
                         "description": device.description,
-                        "directives": [d.frontend() for d in device.directives],
+                        "directives": [
+                            d.frontend() for d in device.directives 
+                            if d.name is not None and d.name.strip() != ""
+                        ],
                     }
                     for device in self
                     if device.group == group