Do not print error message when container does not exist

This fixes a condition when a container is removed while
following the logs and prints an error when the container
is removed forcefully.

Signed-off-by: jgallucci32 <john.gallucci.iv@gmail.com>

libpod/container_log.go

@@ -78,9 +78,11 @@ func (c *Container) readFromLogFile(options *logs.LogOptions, logChannel chan *l
 		if options.Follow {
 			for {
 				state, err := c.State()
-				if err != nil {
+				if err != nil && errors.Cause(err) != define.ErrNoSuchCtr {
 					logrus.Error(err)
 					break
+				} else if err != nil {
+					break
 				}
 				if state != define.ContainerStateRunning && state != define.ContainerStatePaused {
 					err := t.Stop()