Spinner or indicator when no tools visible

[ryansturmer]

When the application is first opened, or if it's on a network with no detectable tools, the blank panel can be a little intimidating, leaving you wondering if the app is actually doing anything. A simple spinner in the middle of the blank window would banish any doubts that the tool is working properly. Second to that, a simple message that says something to the effect of "I can't find any tools" would work.