Fix Undefined array key "#type" warning

Closes #3378186

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• 4be86fda - exposed filter fix: works with gin theme and other themes, retains the 'from/to' labels

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added 2 commits

• 3781383a - phpcs errors
• ab4ffeaf - phpstan error

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added 4 commits

• ab4ffeaf...4c6d1723 - 3 commits from branch project:1.0.x
• caf6ca02 - Merge branch date_filter:1.0.x into 3378186-getting-this-warning

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