The value corresponding to the x axis is not displayed when hovering over a chart

[madalincm]

Steps to Reproduce:

1. Open this queries:
   https://data-stmo-rc.stage.mozaws.net/queries/4#5
   https://data-stmo-rc.stage.mozaws.net/queries/5#7
2. Hover over the chart

Expected results:

When hovering over the chart the x value is displayed.

Actual results:

Only the y value and the "group_value" are displayed

Notes/Issues:

Verified in FF60(Win7). Issue can be reproduced in STMO-stage and STMO-RC
Screencast for this issue:
Line Chart:

Bar Chart:

[madalincm]

Probably a regression from #395

[jezdez]

@madalincm Good catch, I can't seem to figure out how to fix this properly.

@alison985 I've reopened #395 just to make sure we follow up and think about a different solution (including closing as wontfix).

[jezdez]

This has been fixed by reverting #395 and is on release.

[madalincm]

The value is correctly displayed now. I have checked it in RC, Stage and Production
Marking the bug as verified fixed.