PLT_4948 fixing create team javascript error (#4809)

webapp/client/client.jsx

@@ -210,7 +210,7 @@ export default class Client {
         }
 
         if (successCallback) {
-            if (res && res.body) {
+            if (res && res.body !== undefined) { // eslint-disable-line no-undefined
                 successCallback(res.body, res);
             } else {
                 console.error('Missing response body for ' + methodName); // eslint-disable-line no-console

webapp/client/web_client.jsx

@@ -38,7 +38,7 @@ class WebClientClass extends Client {
     }
 
     handleError(err, res) {
-        if (res.body.id === 'api.context.mfa_required.app_error') {
+        if (res && res.body && res.body.id === 'api.context.mfa_required.app_error') {
             window.location.reload();
             return;
         }