Overcloud deployment fails with : "Error: Failed to apply catalog: undefined method `[]' for nil:NilClass"

Issue

• Overcloud deployment is failing with the following error:

            "Debug: Applying settings catalog for sections reporting, metrics", 
            "Debug: Finishing transaction 46051060", 
            "Debug: Received report to process from overcloud-controller-0.localdomain", 
            "Debug: Processing report from overcloud-controller-0.localdomain with processor Puppet::Reports::Store", 
            "Error: Facter: error while resolving custom fact \"rabbitmq_nodename\": undefined method `[]' for nil:NilClass", 
            "Warning: Undefined variable '::deploy_config_name'; ", 
            "   (file & line not available)", 
            "Warning: Undefined variable 'deploy_config_name'; ", 
            "Warning: Undefined variable '::nova::params::vncproxy_service_name'; class ::nova::params has not been evaluated", 
            "Warning: ModuleLoader: module 'mysql' has unresolved dependencies - it will only see those that are resolved. Use 'puppet module list --tree' to see information about modules", 
            "Warning: ModuleLoader: module 'rabbitmq' has unresolved dependencies - it will only see those that are resolved. Use 'puppet module list --tree' to see information about modules", 
            "Warning: ModuleLoader: module 'nova' has unresolved dependencies - it will only see those that are resolved. Use 'puppet module list --tree' to see information about modules", 
            "Warning: ModuleLoader: module 'openstacklib' has unresolved dependencies - it will only see those that are resolved. Use 'puppet module list --tree' to see information about modules", 
            "Warning: This method is deprecated, please use match expressions with Stdlib::Compat::Ip_address instead. They are described at https://docs.puppet.com/puppet/latest/reference/lang_data_type.html#match-expressions. at [\"/etc/puppet/modules/tripleo/manifests/profile/base/database/mysql/client.pp\", 56]:[\"/var/lib/tripleo-config/puppet_step_config.pp\", 38]", 
            "   (at /etc/puppet/modules/stdlib/lib/puppet/functions/deprecation.rb:28:in `deprecation')", 
            "Warning: Unknown variable: '::deployment_type'. at /etc/puppet/modules/tripleo/manifests/profile/base/database/mysql/client.pp:85:31", 
            "Warning: This method is deprecated, please use the stdlib validate_legacy function,", 
            "                    with Stdlib::Compat::Bool. There is further documentation for validate_legacy function in the README. at [\"/etc/puppet/modules/ntp/manifests/init.pp\", 54]:[\"/etc/puppet/modules/tripleo/manifests/profile/base/time/ntp.pp\", 34]", 
            "                    with Stdlib::Compat::Absolute_Path. There is further documentation for validate_legacy function in the README. at [\"/etc/puppet/modules/ntp/manifests/init.pp\", 55]:[\"/etc/puppet/modules/tripleo/manifests/profile/base/time/ntp.pp\", 34]", 
            "                    with Stdlib::Compat::String. There is further documentation for validate_legacy function in the README. at [\"/etc/puppet/modules/ntp/manifests/init.pp\", 56]:[\"/etc/puppet/modules/tripleo/manifests/profile/base/time/ntp.pp\", 34]", 
            "                    with Stdlib::Compat::Array. There is further documentation for validate_legacy function in the README. at [\"/etc/puppet/modules/ntp/manifests/init.pp\", 66]:[\"/etc/puppet/modules/tripleo/manifests/profile/base/time/ntp.pp\", 34]", 
            "                    with Pattern[]. There is further documentation for validate_legacy function in the README. at [\"/etc/puppet/modules/ntp/manifests/init.pp\", 68]:[\"/etc/puppet/modules/tripleo/manifests/profile/base/time/ntp.pp\", 34]", 
            "                    with Stdlib::Compat::Numeric. There is further documentation for validate_legacy function in the README. at [\"/etc/puppet/modules/ntp/manifests/init.pp\", 76]:[\"/etc/puppet/modules/tripleo/manifests/profile/base/time/ntp.pp\", 34]", 
            "Warning: ModuleLoader: module 'pacemaker' has unresolved dependencies - it will only see those that are resolved. Use 'puppet module list --tree' to see information about modules", 
            "                    with Stdlib::Compat::Hash. There is further documentation for validate_legacy function in the README. at [\"/etc/puppet/modules/ssh/manifests/server.pp\", 12]:[\"/var/lib/tripleo-config/puppet_step_config.pp\", 45]", 
            "Warning: tag is a metaparam; this value will inherit to all contained resources in the tripleo::firewall::rule definition", 
            "Error: Failed to apply catalog: undefined method `[]' for nil:NilClass"