Skip URL parsing when rendering empty links in Notebooks. #6889
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If an empty string gets passed to URLExt.isLocal(), then an error gets thrown because an empty URI is eventually created in that code path. The practical consequence of this is that rendering HTML elements with empty links in Notebooks causes errors to be thrown when checking isLocal. This change skips the parsing if there's an empty string, since it's basically "local" by default.
Fixes #6544