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(-)a/C4/Koha.pm (-1 / +3 lines)
Lines 1640-1645 sub GetVariationsOfISBN { Link Here
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    push( @isbns, NormalizeISBN({ isbn => $isbn, format => 'ISBN-10', strip_hyphens => 1 }) );
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    push( @isbns, NormalizeISBN({ isbn => $isbn, format => 'ISBN-10', strip_hyphens => 1 }) );
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    push( @isbns, NormalizeISBN({ isbn => $isbn, format => 'ISBN-13', strip_hyphens => 1 }) );
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    push( @isbns, NormalizeISBN({ isbn => $isbn, format => 'ISBN-13', strip_hyphens => 1 }) );
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    # Strip out any "empty" strings from the array
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    @isbns = grep { /\S/ } @isbns;
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    return wantarray ? @isbns : join( " | ", @isbns );
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    return wantarray ? @isbns : join( " | ", @isbns );
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}
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}
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