"Search for similar" with unannotated tokens

[mbollmann]

Originally reported by: Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann)

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Currently, the "search for similar" option opens the search dialog, and fills it with the current token's annotations. When the token has no annotations, the search dialog remains empty.

Consider adding the token itself to the search criteria, at least in this case, or maybe generally.

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• Bitbucket: https://bitbucket.org/mbollmann/cora/issue/32