tls_auth_is_insecure set empty string as default value for bool

[timchenko-a]

Provider version: 0.4.0
Provider config:

provider "kafka-connect" {
  url = var.connect_url
}

Get the next warning when running terraform commands:

Warning: provider set empty string as default value for bool tls_auth_is_insecure

Seems like variable should have bool as a default value.