Fix broken visualizations of single articles #24
Merged
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Since the ALM API has changed the format of how we return historical data in ALM 3.0, the visualization for single articles is broken. This only affects the citations chart.
The temporary workaround is to properly handle nil. We can later refactor to use the new monthly history data, but first have to switch to the v5 API for that.
Unit tests confirm the expected behaviour.