Changed GetContainerStats to return ErrCtrStateInvalid

This results in some functionality changes:

If a ErrCtrStateInvalid is returned to GetPodStats, the container is ommitted from the stats.
As such, if an empty slice of Container stats are returned to GetPodStats in varlink, an error will occur.
GetContainerStats will return the ErrCtrStateInvalid as well.
Finally, if ErrCtrStateInvalid is returned to the podman stats call, the container will be ommitted from the stats.

Signed-off-by: haircommander <pehunt@redhat.com>

Closes: #1319
Approved by: baude

1 files changed, 1 insertions, 1 deletions

diff --git a/libpod/stats.go b/libpod/stats.go
index 61e85ed5e..9d5efd993 100644
--- a/libpod/stats.go
+++ b/libpod/stats.go
@@ -26,7 +26,7 @@ func (c *Container) GetContainerStats(previousStats *ContainerStats) (*Container
 	}
 
 	if c.state.State != ContainerStateRunning {
-		return stats, nil
+		return stats, ErrCtrStateInvalid
 	}
 
 	cgroupPath, err := c.CGroupPath()