RDFLib / rdflib / 5468438108 / 1

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fix: TriG handling of GRAPH keyword without a graph ID (#2469)

The RDF 1.1 TriG grammar only allows the `GRAPH` keyword if it
is followed by a graph identifier
[[ref](https://www.w3.org/TR/trig/#grammar-production-block)].

This change enforces this rule so that the
<http://www.w3.org/2013/TriGTests/#trig-graph-bad-01> test passes.

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Co-authored-by: WhiteGobo <richardfechner@posteo.net>
Co-authored-by: Iwan Aucamp <aucampia@gmail.com>

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