Return false in busy? calls for servers that has failed to connect.

Author: sersut

lib/net/ssh/multi/server.rb

@@ -140,8 +140,9 @@ def session(require_session=false)
 
     # Returns +true+ if the session has been opened, and the session is currently
     # busy (as defined by Net::SSH::Connection::Session#busy?).
+    # Also returns false if the server has failed to connect.
     def busy?(include_invisible=false)
-      session && session.busy?(include_invisible)
+      !failed? && session && session.busy?(include_invisible)
     end
 
     # Closes this server's session. If the session has not yet been opened,
@@ -228,4 +229,4 @@ def postprocess(readers, writers) #:nodoc:
         session.postprocess(listeners & readers, listeners & writers)
       end
   end
-end; end; end
+end; end; end