Update check.py

Author: hannes-steffenhagen-diffblue

regression/validate-trace-xml-schema/check.py

@@ -33,6 +33,7 @@
     # these test for invalid command line handling
     'bad_option/test_multiple.desc',
     'bad_option/test.desc',
+    'unknown-argument-suggestion/test.desc',
     # this one produces XML intermingled with main XML output when used with --xml-ui
     'graphml_witness2/test.desc',
     # produces intermingled XML on the command line