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* UI: Fix broken Y axis after graph page reload The new `y_axis_min` setting was always encoded into the URL, even if its value was `null` (in which case it would be set to an empty string parameter). On the decoding side, this wasn't taken into account correctly, and we tried to parse the empty string as a float, causing completely broken graphs showing nothing after reloading the graph page with such URL parameters. I'm doing two things now: * For the future, only encode the Y axis min into the URL if it's set at all, similar as we do for the `end_input` and `moment_input` fields. * On the decoding side, accommodate people (at least for now) who already saved some links with the empty `y_axis_min` parameter by treating an empty string as `null` instead of a number. Signed-off-by: Julius Volz <julius.volz@gmail.com> * Add URL state encoding/decoding tests Signed-off-by: Julius Volz <julius.volz@gmail.com> --------- Signed-off-by: Julius Volz <julius.volz@gmail.com>