DE table wrongly displays 2 frequencies when there is no CubeRegion
In the following example, the DE table displays 2 different frequencies when the (single-selection) filter is set to "Annual": https://de-qa.siscc.org/vis?lc=en&df[ds]=OECD-staging&df[id]=NAMAIN1%40NAMAIN1_T0102_Q_capita&df[ag]=OECD.SDD.NAD&df[vs]=1.0&av=true&pd=%2C&dq=..CHL%2BAUS.......&ly[rw]=REF_AREA&ly[cl]=TIME_PERIOD&ly[rs]=PRICES&vw=tb
When looking in F12, it seems that the Actual Content Constraint has no CubeRegion thus the DE doesn't know which frequencies exist. So, there is a 'back-end' issue to investigate (#728 (moved)), but the DE should nonetheless never allow displaying 2 frequencies in the same view.