fix(dash): Init httpRequestSpec's Body properly if rawPayload is not empty

[Akos-T]

Problem

1. Given a POST API with body payload, e.g:

//encore:api public method=POST path=/hello/:name
func World(ctx context.Context, name string, params *RequestType) (*Response, error) {
   // ... 
}

type RequestType struct {
	AlternativeName *string `json:"alternativeName,omitempty" encore:"optional"` // Some description for AlternativeName
	Mambo           string  `json:"mambo,omitempty"`                             // Some description for Mambo
}

2. On the local dashboard when we try this endpoint, leave the body empty:

{ }

3. Getting error:

HTTP 400 Bad Request: { "code": "invalid_argument", "message": "decode request: request_body: missing request body: missing request body", "details": null }

Cause

In cli/daemon/dash/dash.go, addToRequest function we initialize the Body field on the *httpRequestSpec type only if there's content in the processed (hujson) payload, otherwise nil.

Solution

Initialize properly the Body field on the *httpRequestSpec type when the rawPayload is not empty

[encore-cla]

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