Fix "Undefined array key" PHP warning with interwiki links #477
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This fixes #474 that was happening when mPDF was attempting to parse interwiki link "img" tags. The "vertical-align" property should use "middle" instead of "center", as "center" didn't exist as a value for this CSS property.
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This fixes #474 that was happening when mPDF was attempting to parse interwiki link "img" tags. The "vertical-align" property should use "middle" instead of "center", as "center" didn't exist as a value for this CSS property.