? leads to execution of command

[FransM]

With clitest I did enter "show counters ?"
This could e.g. happen if a user is entering show counters and assumes there is an actual argument.
However instead of some help the command is immediately executed (no return pressed).
It seems not correct that the command is executed just by pressing ?

from the log:

router> show counters
called cmd_test with "show counters"
1 arguments:
?