fix(core): update

ts/mailgun.classes.account.ts

@@ -19,7 +19,8 @@ export class MailgunAccount {
       headers: {
         Authorization: `Basic ${plugins.smartstring.base64.encode(`api:${this.apiToken}`)}`,
         'Content-Type': 'application/json'
-      }
+      },
+      keepAlive: false
     };
     let response: plugins.smartrequest.IExtendedIncomingMessage;
     if (!binaryArg) {
@@ -37,7 +38,8 @@ export class MailgunAccount {
       {
         headers: {
           Authorization: `Basic ${plugins.smartstring.base64.encode(`api:${this.apiToken}`)}`
-        }
+        },
+        keepAlive: false
       },
       formFields
     );
@@ -68,13 +70,23 @@ export class MailgunAccount {
         name: 'subject',
         type: 'string',
         payload: smartmailArg.getSubject(dataArg)
-      },
-      {
+      }
+    ];
+
+    if (smartmailArg.getBody(dataArg)) {
+      formFields.push({
         name: 'html',
         type: 'string',
         payload: smartmailArg.getBody(dataArg)
-      }
-    ];
+      });
+    } else {
+      console.log('message has no body');
+      formFields.push({
+        name: 'html',
+        type: 'string',
+        payload: 'The sender did not provide a bodytext.'
+      });
+    }
 
     console.log(smartmailArg.attachments);