Containers can dissappear

Between the time that ps command gets the list of containers
and is able to ask for more data, the container could have
exited.  This patch logs Clibpod.ErrNoSuchCtr errors and just continues
processing.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

Closes: #996
Approved by: mheon

cmd/podman/ps.go

@@ -16,6 +16,7 @@ import (
 	"github.com/projectatomic/libpod/cmd/podman/libpodruntime"
 	"github.com/projectatomic/libpod/libpod"
 	"github.com/projectatomic/libpod/pkg/util"
+	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 	"k8s.io/apimachinery/pkg/fields"
 )
@@ -564,6 +565,10 @@ func getAndSortJSONParams(containers []*libpod.Container, opts batchcontainer.Ps
 	for _, ctr := range containers {
 		batchInfo, err := batchcontainer.BatchContainerOp(ctr, opts)
 		if err != nil {
+			if errors.Cause(err) == libpod.ErrNoSuchCtr {
+				logrus.Warn(err)
+				continue
+			}
 			return nil, err
 		}