(bug) "Snapshot Updated" always reported as true if readFile fails

[JoshuaKGoldberg]

Describe the bug

With this code in a test:

cy.visit('http://localhost:3100');
cy.document().toMatchImageSnapshot();

Cypress never updates the snapshot file, and always marks it as updated:

Error:    CypressError: `cy.readFile()` must be passed a non-empty string as its 1st argument. You passed: ``.

To Reproduce Steps to reproduce the behavior:

1. Set up a new Cypress project (mine is closed source, sorry!)
2. Add cy.document().toMatchImageSnapshot() to a test
3. Launch the Cypress runner

Expected behavior Two things:

• When readFile fails, it should fail the Cypress afterAll command instead of being silently ignored
• readFile shouldn't fail 😄

Screenshots

Desktop (please complete the following information):

• OS: [e.g. OSX, Windows, Linux] OSX
• Cypress Version 7.2.0
• cypress-plugin-snapshots Version: 1.4.4

Additional context Passing a name to the toMatchImageSnapshot call doesn't fix the issue.

[JoshuaKGoldberg]

Closing out my old issues for repos I no longer have context on. If anybody has a need for what this issue was asking about, I'd encourage them/you to file a new issue. Cheers!