panic install if labeled nodes are not found (#5504)

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>

Author: oilbeater

charts/kube-ovn-v2/templates/_helpers.tpl

@@ -72,6 +72,9 @@ Get IP-addresses of master nodes
   {{- end -}}
   {{- end }}
 {{- end -}}
+{{- if eq (len $ips) 0 -}}
+  {{- fail (printf "No nodes found with label '%s'. Please check your masterNodesLabels configuration or ensure master nodes are properly labeled." $.Values.masterNodesLabels) -}}
+{{- end -}}
 {{ join "," $ips }}
 {{- end -}}
 

charts/kube-ovn/templates/_helpers.tpl

@@ -20,6 +20,9 @@ Get IP-addresses of master nodes
     {{- end -}}
   {{- end -}}
 {{- end -}}
+{{- if eq (len $ips) 0 -}}
+  {{- fail (printf "No nodes found with label '%s'. Please check your MASTER_NODES_LABEL configuration or ensure master nodes are properly labeled." $.Values.MASTER_NODES_LABEL) -}}
+{{- end -}}
 {{ join "," $ips }}
 {{- end -}}