WebFluxTags' handling of a null exchange is inconsistent #14504
Description
Some of the methods on WebFluxTags handle a null ServerWebExchange and some do not. This is largely pointless as DefaultWebFluxTagsProvider.httpRequestTags(ServerWebExchange, Throwable) calls them all with the same exchange argument. As far as I know the exchange can never be null so I think we can make things consistent by removing the handling of a null exchange.