Variable groups dont error if they dont exist

[srbry]

All Submissions:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
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What about the current behavior has changed?

You get a terraform error:

Error: rpc error: code = Unavailable desc = transport is closing

This is because the taskagentClient.GetVariableGroup code does not actually return an error when it can't find a variable group, it just returns an empty VariableGroup object.

This PR checks if the Id returned is nil and treats it the same way as if the expected error was returned

Issue Number:

Does this introduce a change to go.mod, go.sum or vendor/?

• Yes
• No

Does this introduce a breaking change?

• Yes
• No

Any relevant logs, error output, etc?

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Other information

[xuzhang3]

@srbry Thanks for your PR, LGTM

[srbry]

@xuzhang3 thanks for merging this so quickly. Do you have any idea when the next version will get released?

[xuzhang3]

@srbry v01.4 will be released today.