[nrf noup] Check if ZAP file was found

Don't run `update_zcl_in_zap` if ZAP file was not found

Signed-off-by: Adrian Gielniewski <adrian.gielniewski@nordicsemi.no>

Author: adigie

scripts/west/zap_gui.py

@@ -70,12 +70,13 @@ def do_run(self, args, unknown_args):
         zap_installer = ZapInstaller(args.matter_path)
         zap_installer.update_zap_if_needed()
 
-        # The zcl.json path in the .zap file must be the same as the one provided by the user
-        # If not, update the .zap file with the new relative path to the zcl.json file.
-        # After that we must clear the ZAP cache.
-        was_updated = update_zcl_in_zap(zap_file_path, zcl_json_path, app_templates_path)
-        if args.cache and was_updated:
-            log.wrn("ZCL file path in the ZAP file has been updated. The ZAP cache must be cleared to use it.")
+        if zap_file_path is not None:
+            # The zcl.json path in the .zap file must be the same as the one provided by the user
+            # If not, update the .zap file with the new relative path to the zcl.json file.
+            # After that we must clear the ZAP cache.
+            was_updated = update_zcl_in_zap(zap_file_path, zcl_json_path, app_templates_path)
+            if args.cache and was_updated:
+                log.wrn("ZCL file path in the ZAP file has been updated. The ZAP cache must be cleared to use it.")
 
         cmd = [zap_installer.get_zap_path()]
         cmd += [zap_file_path] if zap_file_path else []