add tests for missing data

tests/test_sensor.py

@@ -390,6 +390,31 @@ async def test_multi_mcu_sensor_data(hass, get_data, get_printer_objects_list):
     )
 
 
+async def test_multi_mcu_sensor_missing_data(hass, get_data, get_printer_objects_list):
+    """Test."""
+    get_printer_objects_list["objects"].append("mcu Extruder")
+    get_data["status"]["mcu Extruder"] = {
+        "last_stats": None,
+    }
+
+    config_entry = MockConfigEntry(domain=DOMAIN, data=MOCK_CONFIG, entry_id="test")
+    config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    registry = get_entity_registry(hass)
+
+    assert (
+        registry.async_get_entity_id("sensor", DOMAIN, "test_mcu_Extruder_load")
+        is not None
+    )
+
+    assert (
+        registry.async_get_entity_id("sensor", DOMAIN, "test_mcu_Extruder_awake")
+        is not None
+    )
+
+
 async def test_rounding_fan(hass, get_data):
     """Test."""
     get_data["status"]["fan"]["speed"] = 0.33333333333