Refs #17316 - Ensure the proxy exists before assigning tftp
If the subnet.tftp proxy didn't exist, the migration fails with
undefined method `has_feature?' for nil:NilClass'
so we rather make sure it exists before trying to set the templateproxy to nil.
Refs #17316 - Ensure the proxy exists before assigning tftp
If the subnet.tftp proxy didn't exist, the migration fails with
so we rather make sure it exists before trying to set the template
proxy to nil.