Fix Empty Resolver Set

Config.singleResolverSet returns true if all routes have the same resolvers,
even if the routes have no resolvers. If none of the routes have a specific
resolver, the default should be used instead. Therefore, check for more than
0 instead of nil.

Signed-off-by: Ryan Petris <ryan@petris.net>
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f