bug(graph): last known value is used after interruption in data

[jlsjonas]

Originally posted by @hcrohland in https://github.com/kalkih/mini-graph-card/issues/778#issuecomment-1146776434

I have a similar problem: My temperature sensor lost connectivity for some hours:

And now the card shows a constant temperature since then:

Config is:

type: custom:mini-graph-card
entities:
  - entity: sensor.ausentemperatur_temperature
    show_fill: false
  - entity: sensor.ausentemperatur_humidity
    show_fill: false
    show_state: true
    y_axis: secondary
upper_bound_secondary: 100
name: Wetter
icon: mdi:home-thermometer-outline

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