r/azurerm_kusto_eventhub_data_connection: allow for empty table_name and data_format

[favoretti]

Fixes #10838

$ make acctests SERVICE='kusto' TESTARGS='-run=TestAccKustoEventHubDataConnection_unbound' TESTTIMEOUT='600m'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test -v ./azurerm/internal/services/kusto -run=TestAccKustoEventHubDataConnection_unbound -timeout 600m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
2021/03/10 09:45:41 [DEBUG] not using binary driver name, it's no longer needed
2021/03/10 09:45:41 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccKustoEventHubDataConnection_unboundMapping1
=== PAUSE TestAccKustoEventHubDataConnection_unboundMapping1
=== RUN   TestAccKustoEventHubDataConnection_unboundMapping2
=== PAUSE TestAccKustoEventHubDataConnection_unboundMapping2
=== CONT  TestAccKustoEventHubDataConnection_unboundMapping1
=== CONT  TestAccKustoEventHubDataConnection_unboundMapping2
--- PASS: TestAccKustoEventHubDataConnection_unboundMapping1 (1574.67s)
--- PASS: TestAccKustoEventHubDataConnection_unboundMapping2 (1747.31s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/kusto	1748.615s

[katbyte]

LGTM 👍

[ghost]

This has been released in version 2.51.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.51.0"
}
# ... other configuration ...

[ghost]

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