Fix issue with datalink url value

[spacemansteve]

Tokens in url field are being concatenated:
data_links_rows": [{"url": ["1971ATsir.615....4D1971ATsir.621....7D1971ATsir.624....1D1973ATsir.759....6D1974Afz....10..315D1974ATsir.809....1D1974ATsir.809....2D1974ATsir.837....2D1976Afz....12..665D1983Afz....19..229D1983Ap.....19..134D1984Afz....20..525D1984Ap.....20..290D"], "title": ["Part 1Part 3Part 5Part 8Part 3Part 4Part 6Part 7Part 9Part 10"],