The tag may be too meta or too general to provide useful information about a post.
Practically all code ever written uses conditions in one form or another. All loops also have conditions. As such, we could tag practically every question with conditions, which then makes the tag useless.
Looking through the questions tagged with it, I could not find any particularly distinguishing feature to justify the use of that tag. I tried to find a question that was "about conditions" rather than just "uses conditions" but did not find such a question.
At the moment the tag only has 4 followers. I personally cannot think of any particularly good reason to keep that tag around, though if someone can make a case for it, by all means please do so!