Return error when no testsuite results are detected

Author: patrick-rivos

scripts/testsuite-filter

@@ -271,7 +271,7 @@ def filter_result(tool, libc, white_list_base_dir, unexpected_results):
                 fail_count = summary[config][tool]
                 print ("%13d |" % fail_count, end='')
         print ("")
-    if any_fail:
+    if any_fail or len(summary.items()) == 0:
         return 1
     else:
         return 0