[lvgl] Fix crash with unconfigured top_layer (#13846)

esphome/components/logger/logger_zephyr.cpp

@@ -68,7 +68,7 @@ void HOT Logger::write_msg_(const char *msg, uint16_t len) {
 #ifdef CONFIG_PRINTK
   // Requires the debug component and an active SWD connection.
   // It is used for pyocd rtt -t nrf52840
-  k_str_out(const_cast<char *>(msg), len);
+  printk("%.*s", static_cast<int>(len), msg);
 #endif
   if (this->uart_dev_ == nullptr) {
     return;

esphome/components/lvgl/schemas.py

@@ -436,6 +436,7 @@ def container_schema(widget_type: WidgetType, extras=None):
     schema = schema.extend(widget_type.schema)
 
     def validator(value):
+        value = value or {}
         return append_layout_schema(schema, value)(value)
 
     return validator

tests/components/lvgl/test.host.yaml

@@ -20,6 +20,8 @@ lvgl:
   - id: lvgl_0
     default_font: space16
     displays: sdl0
+    top_layer:
+
   - id: lvgl_1
     displays: sdl1
     on_idle: