[wp-trac] [WordPress Trac] #53416: block.json without a `supports` key throws notice

[WordPress Trac]

#53416: block.json without a `supports` key throws notice
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 Reporter:  walbo         |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 When WordPress converts typography keys declared under `supports.*` to
 `supports.typography.*` is never checks if `supports` is defined and
 throws an undefined index on blocks without a supports key.

 Steps to reproduce:
 - Create a block without adding `supports` to the `block.json` and
 register the block using `register_block_type_from_metadata`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53416>
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