feat: change the new Space

src/common/model/user/User.ts

@@ -31,7 +31,7 @@ export default class User extends BaseEntity {
   lastTime: Date = new Date();
   status: UserStatus = UserStatus.OK;
   spaceUuid: string | null = null;
-  space: Space | null = null;
+  space: Space = new Space();
 
   constructor(reactComponent?: React.Component) {
     super(reactComponent);

src/pages/matter/List.tsx

@@ -427,7 +427,7 @@ export default class List extends TankComponent<IProps, IState> {
         m.spaceUuid = this.getSpaceUuid();
 
         //判断文件大小。
-        if (this.user.space!.sizeLimit >= 0) {
+        if (this.user.space.sizeLimit >= 0) {
           if (file.size > this.user.space!.sizeLimit) {
             MessageBoxUtil.error(
               Lang.t(