cannot load image of conversation before it's joined

[mahibi]

Steps to reproduce

it seems we cannot load the avatars of conversations that we didn't join. For example on sermo search for "test" and look at the open conversations...

Expected behaviour

Items already show the image before joining the conversation

Actual behaviour

before joining:

after joining:

tested on sermo (28.0.0 dev)
noticed this issue when working on android solution for #6431

[SystemKeeper]

#9600

[mahibi]

#9600

thx, so closing as dup..