fix: Attempting to send body in GET/DELETE requests

Author: cbaker6

lib/client.js

@@ -567,7 +567,7 @@ module.exports = function (dependencies) {
       responseData += data;
     });
 
-    if (Object.keys(notification.body).length > 0) {
+    if (notification.body !== "") {
       request.write(notification.body);
     }
 

test/client.js

@@ -1761,7 +1761,7 @@ describe('ManageChannelsClient', () => {
       const mockHeaders = { 'apns-channel-id': channel, ...additionalHeaderInfo };
       const mockNotification = {
         headers: mockHeaders,
-        body: {},
+        body: "",
       };
       const bundleId = BUNDLE_ID;
       const result = await client.write(mockNotification, bundleId, 'channels', 'delete');
@@ -1822,7 +1822,7 @@ describe('ManageChannelsClient', () => {
       const mockHeaders = { 'apns-request-id': requestId };
       const mockNotification = {
         headers: mockHeaders,
-        body: {},
+        body: "",
       };
       const bundleId = BUNDLE_ID;
       const result = await client.write(mockNotification, bundleId, 'allChannels', 'get');