changed rescue to ensure block in Busy.busy

lib/hobo/busy.rb

@@ -31,6 +31,11 @@ module Hobo
             Busy.busy = false
           end
         end
+        
+        # In the case were an exception is thrown by the wrapped code
+        # make sure to set busy to sane state and reraise the error
+      ensure
+        Busy.busy = false
       end
     end
   end