Add better error handling for Tree Listing

[WilsonNet]

A very basic error handling was added to Tree Listing
a new better one would be nice

More details in:
#56 (comment)

[murilx]

@MarceloRobert another one we might be able to close, I believe we are using the QuerySwitcher on Tree Listing now, aren't we?

[MarceloRobert]

Not yet, there is still a simple message there for the error of the TreeView endpoint