fix(nextjs): Check for existence of default export when wrapping pages #8794
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Fixes #8792
In #8792 a user reports that we read
getInitialProps
fromundefined
. The only place where we readgetInitialProps
is in the page wrapper template. As a fix we simply check for its existence before accessing the field. We don't fully know yet how this can happen, but I guess it can't hurt to introduce this check.