Make Avatar Loading from IPFS more resilient

[ohager]

Is your feature request related to a problem? Please describe. The avatar image is being loaded from IPFS. Due to the typical IPFS discovery time, it happens that the image cannot be loaded...

Describe the solution you'd like Using img onerror event would allow to refetch the image, until it is successful. Also, would be favorable, if there is an alternative placeholder image, instead of browsers default broken image thing...