Non-existing data in experiments issue #418
Description
While comparing experiments data, non-existing data for a sensor could be misleading. The value field is not filled, but the graph is, and seems like it's constant (which could be in some cases):
In addition, when browsing on the two graphs, if browsing on the one with data, the one without data shows nothing (good, shown above). However, when doing the opposite, placing the cursor on the one without data, the cursor sticks to the closest data point, but still shows it on the point where the cursor is (for both graphs):
