cmake: remove debug message if no modules are included in build.

Fixes: #13245

Remove the printing of: 'Including module(s)' when no modules are
included into the CMake build.

Signed-off-by: Torsten Rasmussen <[email protected]>

Author: tejlmand

CMakeLists.txt

@@ -568,7 +568,9 @@ add_subdirectory(subsys)
 add_subdirectory(drivers)
 
 # Add all zephyr modules subdirectories.
-message("Including module(s): ${ZEPHYR_MODULES_NAME}")
+if(ZEPHYR_MODULES_NAME)
+  message("Including module(s): ${ZEPHYR_MODULES_NAME}")
+endif()
 set(index 0)
 foreach(module_name ${ZEPHYR_MODULES_NAME})
   list(GET ZEPHYR_MODULES_DIR ${index} module_dir)