In this situation, how to deal with the attachment card?

I have a Army Card in play, such as War Host of the North(S16), and then i used ability of Renly's Courtier(B86) to blank War Host of the North text box until the end of the phase. So no attachments is not available on War Host of the North, and i can attach a attachment card to War Host of the North. But at the end of the phase, must i discard this attachment card? or i can keep this card?

At any moment where the conditions to attach the cards are not fullfilled, tue attachement is discarded.

So when your army become "no attachements" again, you have to discard it immediately.

But i was asking me with a friend: What would happen if we attach a milk of the poppy while the army is blanked ? I suppose it stay at the end of the phase but I'm not 100% sure.

Milk of the Poppy would stay and the Army would be blanked until it were discarded.