kernel-shark: Less scary error message from Capture dialog

Most likely the reason for this error to occur is that the KernelShark GUI
is not open (was closed).

Link: http://lore.kernel.org/linux-trace-devel/20190709155650.2345-9-y.karadz@gmail.com

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 file changed