fix unit tests; update config docs

Signed-off-by: hfuss <hayden.fuss@kaleido.io>

Author: onelapahead

doc-site/docs/reference/config.md

@@ -754,7 +754,7 @@ title: Configuration Reference
 |---|-----------|----|-------------|
 |count|The maximum number of times to retry|`int`|`5`
 |enabled|Enables retries|`boolean`|`false`
-|errorStatusCodeRegex|The regex that the error response status code must match to trigger retry|`string`|`<nil>`
+|errorStatusCodeRegex|The regex that the error response status code must match to trigger retry|`string`|`^5|^429$`
 |initWaitTime|The initial retry delay|[`time.Duration`](https://pkg.go.dev/time#Duration)|`250ms`
 |maxWaitTime|The maximum retry delay|[`time.Duration`](https://pkg.go.dev/time#Duration)|`30s`
 

internal/blockchain/ethereum/ethereum.go

@@ -627,7 +627,7 @@ func (e *Ethereum) invokeContractMethod(ctx context.Context, address, signingKey
 	if err != nil || !res.IsSuccess() {
 		// 409 is a conflict error, so that means the transaction was already submitted / exists
 		// so we can return a success w/o error
-		if res.StatusCode() == 409 && !resErr.SubmissionRejected {
+		if res != nil && res.StatusCode() == 409 && !resErr.SubmissionRejected {
 			return false, nil
 		}
 
@@ -774,7 +774,7 @@ func (e *Ethereum) DeployContract(ctx context.Context, nsOpID, signingKey string
 	if err != nil || !res.IsSuccess() {
 		// 409 is a conflict error, so that means the transaction was already submitted / exists
 		// so we can return a success w/o error
-		if res.StatusCode() == 409 && !resErr.SubmissionRejected {
+		if res != nil && res.StatusCode() == 409 && !resErr.SubmissionRejected {
 			return false, nil
 		}
 		if strings.Contains(string(res.Body()), "FFEC100130") {