Edge Case: Blank error in some PCH panels when no credentials set about wp-parsely HOT 3 CLOSED

Currently assigning this to the 3.13.1 milestone, but might push it to another milestone if it needs work that will take some time.

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After further looking into this, here are my conclusions:

• The component handles errors as it should.
• The issue with the blank panel occurs only with the testing scenario outlined above, which is an edge case. Although it could occur, the ROI is probably very low if we need significant work for a refactor to make this work.

The root of the issue is that in the specific state, the window.wpParselyEmptyCredentialsMessage variable is undefined, and we're calling the EmptyCredentialsMessage component which uses that variable as the value to display. Given that, there's nothing to display, and thus the blank panel.

I don't think there's particular urgency in releasing a fix for this and we may need to touch different places in the code, so I'm removing it from the 3.13.1 milestone.

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Update: This also affects the Excerpt Generator when tested similarly. In this case the panel's content will not vanish, but it will display an empty notice which is visible by the blue border on the left.

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