Fix event handler logic and error-msg typo
Fix event handler logic and error-msg typo

Since AssetAdded was handled outside the larger branching block,
it lead to an inaccurate error being logged.

hackaugusto/raiden,hackaugusto/raiden,tomashaber/raiden,tomaaron/raiden,tomaaron/raiden,tomashaber/raiden,tomaaron/raiden,charles-cooper/raiden,charles-cooper/raiden,tomashaber/raiden,tomashaber/raiden,tomaaron/raiden,tomashaber/raiden