fix(gatsby-source-contentful): don't call createNode
on null
#37958
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I introduced a small regression in #37910.
entryNode
items may be null via https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-source-contentful/src/normalize.js#L496. This PR just checks that the entry node item exists before callingcreateNode
on it