Fixup status gadget

This fixes the error, often found:

....
Online: true


Document id must be a non empty string on 'erp5.get'.
Stack: Error
    at https://panel.rapid.space/jiodev.js:8147:24
    at https://panel.rapid.space/jiodev.js:8660:2
---
stopping ERP5JS
Stack: Error: stopping ERP5JS
    at displayErrorContent (https://panel.rapid.space/erp5_launcher_nojqm.js:144:21)
    at displayError (https://panel.rapid.space/erp5_launcher_nojqm.js:230:12)
    at RenderJSEmbeddedGadget.reportServiceError (https://panel.rapid.space/erp5_launcher_nojqm.js:923:14)
    at ensurePushableQueue (https://panel.rapid.space/renderjs.js:800:25)
    at RenderJSEmbeddedGadget.acquire (https://panel.rapid.space/renderjs.js:1584:12)
    at createSuperKlass.__aq_parent (https://panel.rapid.space/renderjs.js:1632:24)
    at createSuperKlass.acquire (https://panel.rapid.space/renderjs.js:1573:21)
    at createSuperKlass.__aq_parent (https://panel.rapid.space/renderjs.js:1632:24)
    at createSuperKlass.acquire (https://panel.rapid.space/renderjs.js:1573:21)
    at createSuperKlass.__aq_parent (https://panel.rapid.space/renderjs.js:1632:24)

And it improve error message so that we can have better understanding of the error.