dispatcher: drop a useless condition

dispatcher: drop a useless condition

The request->scripts are allocated in handle_action() and request_free() is
only called after that, so it never sees it NULL. Coverity knows:

CID 59385 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking request->scripts suggests that it may be null,
but it has already been dereferenced on all paths leading to the check.