mgr/dashboard: fix Nan undefined values and add empty pipe on expand-cluster

[Pegonzal]

In many places around the dashboard the value NaN undefined was being shown, fixed to show N/A when needed

Before:

Now:

Fixes: https://tracker.ceph.com/issues/61207
Signed-off-by: Pedro Gonzalez Gomez pegonzal@redhat.com

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[nizamial09]

@Pegonzal the commit doesn't have the tracker attached!

[Pegonzal]

@Pegonzal the commit doesn't have the tracker attached!

Fixed it