Gracefully handle missing preset name (#356)

Author: frenck

src/wled/models.py

@@ -460,7 +460,7 @@ def from_dict(
 
         return Preset(
             main_segment=main_segment,
-            name=data["n"],
+            name=data.get("n", str(preset_id)),
             on=data.get("on", False),
             preset_id=preset_id,
             quick_label=data.get("ql"),