empty component causes shift/reduce conflict

[Jibin Han]

Hello,
    I am new to bison, but from my experience, if there is an empty
component in a rule like this,
        result: /* empty */
                |
                comp1 comp2 {...}

    then it definetely causes shift/reduce conflict. But such conflict
in this case is harmless because the Bison default choice, shift comp1,
is always what we want.
    Do you think so?

Thanks!