Use if for depends_on validation

Author: cursoragent

.github/scripts/validate-services-catalog.rb

@@ -69,14 +69,14 @@ def error(errors, service, message)
   end
 
   depends_on = service.fetch("depends_on", [])
-  unless depends_on.is_a?(Array)
-    error(errors, name, "depends_on must be a list when present")
-  else
+  if depends_on.is_a?(Array)
     depends_on.each do |dependency|
       unless services.key?(dependency)
         error(errors, name, "depends_on references unknown service #{dependency.inspect}")
       end
     end
+  else
+    error(errors, name, "depends_on must be a list when present")
   end
 
   next unless service.key?("proto_consumer")