Let me know if I'm reading this correctly. Chun-Li's counter-attack reads:
Put a weakness or starter card from any foe's discard pile on top of your deck.
Let's say that in a two player game, the counter-attacker has no starters or weaknesses in his discard pile. Does the counter-attack fizzle or would that foe take a weakness from the weakness stack and place it on top of his deck?