Should not error out if container no longer exists in oci

This prevents you from cleaning up the container database, if
some how runc and friends db gets screwed up.

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

Closes: #725
Approved by: mheon

libpod/oci.go

@@ -10,6 +10,7 @@ import (
 	"path/filepath"
 	"runtime"
 	"strconv"
+	"strings"
 	"sync"
 	"syscall"
 	"time"
@@ -399,15 +400,18 @@ func (r *OCIRuntime) updateContainerStatus(ctr *Container) error {
 	// Store old state so we know if we were already stopped
 	oldState := ctr.state.State
 
-	out, err := exec.Command(r.path, "state", ctr.ID()).Output()
+	out, err := exec.Command(r.path, "state", ctr.ID()).CombinedOutput()
 	if err != nil {
+		if strings.HasSuffix(string(out), "does not exist") {
+			ctr.removeConmonFiles()
+			ctr.state.State = ContainerStateConfigured
+			return nil
+		}
 		return errors.Wrapf(err, "error getting container %s state. stderr/out: %s", ctr.ID(), out)
 	}
-
 	if err := json.NewDecoder(bytes.NewBuffer(out)).Decode(state); err != nil {
 		return errors.Wrapf(err, "error decoding container status for container %s", ctr.ID())
 	}
-
 	ctr.state.PID = state.Pid
 
 	switch state.Status {