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Description
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Currently the minimum number of nodes in Upstream is 1, while using ingress-apisix in Kubernetes, people may create ApisixUpstream or ApisixRoute with an bad Service/Endpoints, which causes ingress-apisix push an Upstream but with an empty nodes field, and APISIX returns 400. So is there any restrictions that we must have at least one node?
Describe the solution you'd like
Allow empty node in Upstream.