Return error if create credential request is not a bad request (#4874)

# Description

_Please explain the changes you've made._

## Issue reference

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Fixes: #issue_number

## Checklist

Please make sure you've completed the relevant tasks for this PR, out of
the following list:

* [x] Code compiles correctly
* [ ] Adds necessary unit tests for change
* [ ] Adds necessary E2E tests for change
* [x] Unit tests passing
* [ ] Extended the documentation / Created issue for it

Co-authored-by: Bharath Joginapally <[email protected]>

pkg/ucp/frontend/controller/credentials/aws/createorupdatecredential.go

@@ -51,6 +51,8 @@ func (p *CreateOrUpdateCredential) Run(ctx context.Context, w http.ResponseWrite
 		errors.Is(err, conv.ErrInvalidModelConversion) ||
 		errors.Is(err, &conv.ErrModelConversion{}) {
 		return armrpc_rest.NewBadRequestResponse(err.Error()), nil
+	} else if err != nil {
+		return nil, err
 	}
 
 	if newResource.Properties.Kind != datamodel.AWSCredentialKind {

pkg/ucp/frontend/controller/credentials/azure/createorupdatecredential.go

@@ -51,6 +51,8 @@ func (p *CreateOrUpdateCredential) Run(ctx context.Context, w http.ResponseWrite
 		errors.Is(err, conv.ErrInvalidModelConversion) ||
 		errors.Is(err, &conv.ErrModelConversion{}) {
 		return armrpc_rest.NewBadRequestResponse(err.Error()), nil
+	} else if err != nil {
+		return nil, err
 	}
 
 	if newResource.Properties.Kind != datamodel.AzureCredentialKind {