A good question is a good question, even if it is homework.
In my experience most poor questions stem from a "please spoon feed me" vantage, and this starting point often doesn't have anything to do with homework. I know, because some of the poor questions are mine, and I haven't been in school for a long long time. :) Perhaps they just don't have the right search terms. Perhaps the OP is in way over their head and just can't think any more. Perhaps this is the 10th problem on their desk this morning and they just need it gone. Etc.
In all cases the response is the same, treat it like any poor question: gently ask for more details and context, tease out specific confusion points, provide some possible avenues to improve the Q presentation. Someone genuinely interested in an answer will engage and the question will improve. If there is no engagement, down vote if required, and move along, placing your energy where it's valued.
In short, we don't need do anything special for homework (in my opinion).