You might want to search these threads, as I vaguely remember this being answered before.
I believe the final answer was if you know *for sure* you are not going to receive goods, you can take them during your turn...but only if you are 100% sure you will not be receiving any goods as part of your placement.
Again, I'm not 100% positive on that...but pretty sure that's how it was ruled.
Found the designer's answer here: https://boardgamegeek.com/article/13922051#13922051
EDIT: Corrected the link