Graph card does not use entity name by default

[TheZoker]

Describe the bug The graph card does not use the entity name by default. It just shows n/a if nothing is specified.

To Reproduce

1. Create a graph card:
2. Don't set ulm_card_graph_name

Expected behavior Take the entity name by default.

Screenshots

Additional context

- type: 'custom:button-card'
  template: card_graph
  variables:
    ulm_card_graph_entity: sensor.temperature_inside
    ulm_card_graph_type: fill
    ulm_card_graph_hours: 24

[AndyVRD]

Will be fixed in a new update i will release a PR for this weekend.

[TheZoker]

Should also be fixed in this PR: https://github.com/UI-Lovelace-Minimalist/UI/pull/500 Please have a look at it