Cable: Shush pop warnings when skipping Postgres tests.

`skip` raises an exception to abort the execution of the test, so
`super` would never be called and thus `@rx_adapter` and `@tx_adapter`
would never have been defined at the time of teardown.

Define them just before skipping and zap the warnings.

1 files changed, 1 insertions, 0 deletions

diff --git a/actioncable/test/subscription_adapter/postgresql_test.rb b/actioncable/test/subscription_adapter/postgresql_test.rb
index 3b4fadbb2a..214352a0b2 100644
--- a/actioncable/test/subscription_adapter/postgresql_test.rb
+++ b/actioncable/test/subscription_adapter/postgresql_test.rb
@@ -21,6 +21,7 @@ class PostgresqlAdapterTest < ActionCable::TestCase
     begin
       ActiveRecord::Base.connection
     rescue
+      @rx_adapter = @tx_adapter = nil
       skip "Couldn't connect to PostgreSQL: #{database_config.inspect}"
     end