Bugfix: Graph component becomes unresponsive if an invalid figure is passed

[KoolADE85]

This PR fixes a bug where a Graph with an invalid figure prop (for example, figure=None) would remain broken even after being updated to a valid figure.

See the integration test for an example Dash app that is fixed here.

Fixes https://github.com/plotly/notebook-to-app/issues/2065

Contributor Checklist

• I have run the tests locally and they passed. (refer to testing section in contributing)
• I have added tests, or extended existing tests, to cover any new features or bugs fixed in this PR

optionals

• I have added entry in the CHANGELOG.md
• If this PR needs a follow-up in dash docs, community thread, I have mentioned the relevant URLS as follows
  • this GitHub #PR number updates the dash docs
  • here is the show and tell thread in Plotly Dash community

[T4rk1n]

💃 Looks good, just add a changelog entry.

[AnnMarieW]

closes #2992