Return immediately from 'check-testcase' and 'check_warnings' if no

check processes has been started

mysql-test/mysql-test-run.pl

@@ -2588,6 +2588,9 @@ sub check_testcase($$)
     }
   }
 
+  # Return immediately if no check proceess was started
+  return 0 unless ( keys %started );
+
   while (1){
     my $result;
     my $proc= My::SafeProcess->wait_any();
@@ -3024,6 +3027,9 @@ sub check_warnings ($) {
     }
   }
 
+  # Return immediately if no check proceess was started
+  return 0 unless ( keys %started );
+
   while (1){
     my $result= 0;
     my $proc= My::SafeProcess->wait_any();