Zeronet not working in official latest release - window.wrapper is undefined (version 0.7.1)

### Step 1: Please describe your environment

* ZeroNet version: 0.7.1 (rev 4206)
* Operating system: Manjaro
* Web browser: Firefox 81.0 64-bit (including incognito, including all extensions turned off)
* Tor status: disabled
* Opened port: yes
* Special configuration: no

### Step 2: Describe the problem:

Échec du chargement pour l’élément dont la source est « http://127.0.0.1:43110/uimedia/all.js?rev=4206&lang=fr ». 1HeLLo4uzjaLetFx6NH3PMwFP3qbRbTf3D:95:1
Uncaught TypeError: window.wrapper is undefined
<anonymous> http://127.0.0.1:43110/1HeLLo4uzjaLetFx6NH3PMwFP3qbRbTf3D:96

Sites don't load properly.

#### Steps to reproduce:

1. Enter any zeronet site.

#### Observed Results:


#### Expected Results:

Sites load properly.

Reproduce the failure by opening any ZeroNet site with version 0.7.1, then inspect uimedia/all.js and the site script around line 96 where window.wrapper is accessed. Trace why window.wrapper is undefined and verify that sites load properly after the issue is addressed.

索引モデルが issue の本文から書いたものです。