Fix Clean CryptDrive button in settings

www/common/cryptpad-common.js

@@ -77,7 +77,7 @@ define([
     // Settings only
     common.resetDrive = function (cb) {
         postMessage("RESET_DRIVE", null, function (obj) {
-            if (obj.error) { return void cb(obj.error); }
+            if (obj && obj.error) { return void cb(obj.error); }
             cb();
         });
     };

www/common/outer/async-store.js

@@ -635,7 +635,7 @@ define([
             nThen(function (waitFor) {
                 removeOwnedPads(waitFor);
             }).nThen(function () {
-                store.proxy.drive = store.fo.getStructure();
+                store.proxy.drive = store.userObject.getStructure();
                 sendDriveEvent('DRIVE_CHANGE', {
                     path: ['drive', 'filesData']
                 }, clientId);