alter identity_id check to be non-empty

[Lucretius]

Fixes a bug I introduced in #3183. Big thanks for the catch by @adamday2 - I have fixed the validation to just check for non-zero values. I did not see an existing check for an exact resource ID regex - something to consider at a later date I suppose.

[katbyte]

Thanks for the speedy fix @Lucretius, LGTM 👍

[ghost]

This has been released in version 1.25.0 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 = "~> 1.25.0"
}
# ... other configuration ...

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!