[NXP][scripts] Fix script issue when there is no --args

Signed-off-by: Martin Girardot <martin.girardot@nxp.com>

Author: Martin-NXP

scripts/build/builders/nxp.py

@@ -250,7 +250,8 @@ def generate(self):
                         cmd += 'export NXP_K32W0_SDK_ROOT="' + str(p.sdk_storage_location_abspath) + '" \n '
                     elif p.sdk_name == 'common':
                         cmd += 'export NXP_SDK_ROOT="' + str(p.sdk_storage_location_abspath) + '" \n '
-            cmd += 'gn gen --check --fail-on-unused-args --export-compile-commands --root=%s' % self.root
+            # add empty space at the end to avoid concatenation issue when there is no --args
+            cmd += 'gn gen --check --fail-on-unused-args --export-compile-commands --root=%s ' % self.root
 
             extra_args = []