fix SetRecipients clear empty strings

Author: EduardoJaco

model.go

@@ -54,9 +54,9 @@ type Attachment struct {
 type Message struct {
 	Subject       string       `json:"subject"`
 	Body          Body         `json:"body"`
-	ToRecipients  []Recipient  `json:"toRecipients"`
-	CcRecipients  []Recipient  `json:"ccRecipients"`
-	BccRecipients []Recipient  `json:"bccRecipients"`
+	ToRecipients  []Recipient  `json:"toRecipients,omitempty"`
+	CcRecipients  []Recipient  `json:"ccRecipients,omitempty"`
+	BccRecipients []Recipient  `json:"bccRecipients,omitempty"`
 	Attachments   []Attachment `json:"attachments,omitempty"`
 }
 

send_email.go

@@ -45,12 +45,13 @@ func (c *Client) SendEmail(subject, body string, contentType ContentType, saveSe
 }
 
 func SetRecipients(recipients []string) []Recipient {
-	result := make([]Recipient, len(recipients))
-	for i, recipient := range recipients {
-		result[i] = Recipient{
-			EmailAddress: EmailAddress{
-				Address: recipient,
-			},
+	result := make([]Recipient, 0)
+	for _, recipient := range recipients {
+		if recipient != "" {
+			result = append(result, Recipient{
+				EmailAddress: EmailAddress{
+					Address: recipient,
+				}})
 		}
 	}
 	return result