Fixes blank panel

[NejcZdovc]

Resolves brave/brave-browser#6012

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Test Plan:

defined in the issue

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• New files have MPL-2.0 license header.
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After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
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• All relevant documentation has been updated.

[bsclifton]

As discussed, this does fix the symptom - but the root cause as we found was that data is in a bad state when loading

[bsclifton]

@NejcZdovc I think we need this along with 7d80348, right?
(in 0.69.x / 0.70.x / 0.71.x / master)

We merged both in 0.68.x for Chromium 77:

• this: 760bf2e
• first fix attempt: 7d80348

[NejcZdovc]

@bsclifton that is correct, let me put it in the PR

[bsclifton]

++