This commit fixes URL malformation when trying to remove the utm social
query parameters from an URL, which upon finishing and reconstructing
would attach the equal symbol even if the original URL didn't have it.
This is a known Go "bug" [1] that isn't going to be "fixed". I quote
that because server side should behave the same for `?a=&b=1` and
`?a&b=1` for the `a` parameter, but sometimes that's not the case.
[1]: https://github.com/golang/go/issues/20820Fixes#409