filter feedback 0 for nevigate feedback

[zhiwehu]

trafficstars

if filter the nevigate (value is 0), it'll make feedback value to None then it'll filter all the threads.

[dokterbob]

Thanks for the contrib! @qtangs is currently working on a full refactor of the SQLAlchemy stuff, I already asked him to take this into account. It would be good to have unittest for this as well.

[dokterbob]

@dosu Is there perhaps a more elegant and readable way to implement the same functionality?

[willydouhard]

Closing this as it is outdated