fix(ui): handle missing or empty local version values and standardize defaults

* fix: corrected back navigation in advanced menu in reference to #761

* ci: add delay after warning when no MCUs are found

kiauh/components/klipper_firmware/menus/klipper_flash_menu.py

@@ -236,9 +236,11 @@ class KlipperSelectMcuConnectionMenu(BaseMenu):
         if len(self.flash_options.mcu_list) < 1:
             Logger.print_warn("No MCUs found!")
             Logger.print_warn("Make sure they are connected and repeat this step.")
+            time.sleep(3)
+            return
 
         # if standalone is True, we only display the MCUs to the user and return
-        if self.__standalone and len(self.flash_options.mcu_list) > 0:
+        if self.__standalone:
             Logger.print_ok("The following MCUs were found:", prefix=False)
             for i, mcu in enumerate(self.flash_options.mcu_list):
                 print(f"   ● MCU #{i}: {Color.CYAN}{mcu}{Color.RST}")

kiauh/components/webui_client/client_utils.py

@@ -152,7 +152,7 @@ def symlink_webui_nginx_log(
 def get_local_client_version(client: BaseWebClient) -> str | None:
     relinfo_file = client.client_dir.joinpath("release_info.json")
     version_file = client.client_dir.joinpath(".version")
-    default = "n/a"
+    default = "-"
 
     if not client.client_dir.exists():
         return default

kiauh/core/menus/update_menu.py

@@ -257,14 +257,14 @@ class UpdateMenu(BaseMenu):
 
     def _format_local_status(self, local_version, remote_version) -> str:
         color = Color.RED
-        if not local_version:
+        if not local_version or local_version == '-':
             color = Color.RED
         elif local_version == remote_version:
             color = Color.GREEN
         elif local_version != remote_version:
             color = Color.YELLOW
 
-        return Color.apply(local_version or "-", color)
+        return str(Color.apply(local_version or '-', color))
 
     def _set_status_data(self, name: str, status_fn: Callable, *args) -> None:
         comp_status: ComponentStatus = status_fn(*args)