bots: Continue downloading image after error
bots: Continue downloading image after error

It can happen often that during image download some error occurs (most likely you loose internet connection). Then downloading needs to
start from beginning, which is very annoying, especially on a slow
internet connection.

Closes #11457
moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,deryni/cockpit,mvollmer/cockpit,deryni/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpituous/cockpit,mvollmer/cockpit,garrett/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,deryni/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,cockpituous/cockpit,deryni/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,garrett/cockpit,cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,mvollmer/cockpit,martinpitt/cockpit,garrett/cockpit,martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit