fix: prevent nil pointer panic in handleAssociate logging#113
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RemoteAddr() can return nil for UDP connections in certain states. Calling .String() on nil net.Addr causes a panic. Add addrString() helper that safely handles nil addresses. Fixes things-go#112
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RemoteAddr() can return nil for UDP connections in certain states. Calling .String() on nil net.Addr causes a panic. Add addrString() helper that safely handles nil addresses.
Fixes #112