grobidOrg / grobid / 28008466382 / 1

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Handle weird whitespace unstructured from Crossref (#1407)

A citation made only of non-breaking spaces (U+00A0) previously produced an
HTTP 500 (NPE) from processCitationList. UnicodeUtil.normaliseText() collapses
such input to blank, so the parser yields empty content and the REST layer
returns 204 No Content. 
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Signed-off-by: Luca Foppiano <luca@foppiano.org>

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