[Bug 1566185] [NEW] Disappearing Event Report Visualizations

Public bug reported:

DHIS 2.20 rev. 19968

The trigger for the disappearance is unknown.

Visualizations in the dashboards are appearing blank and yet they were previously populated. Clicking to 'explore' a blank visualization results in one of two error messages:
1. 'At least one row must be specified as column, row or filter'.
2. 'Code: 409 / Status: Conflict / Start and end date or at least one period must be specified'

Reviewing the XML of the favorites shows the period dimension is
missing.

** Affects: dhis2
     Importance: Undecided
         Status: New

** Tags: dashboard missing visualization

···

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https://bugs.launchpad.net/bugs/1566185

Title:
  Disappearing Event Report Visualizations

Status in DHIS:
  New

Bug description:
  DHIS 2.20 rev. 19968

  The trigger for the disappearance is unknown.

  Visualizations in the dashboards are appearing blank and yet they were previously populated. Clicking to 'explore' a blank visualization results in one of two error messages:
  1. 'At least one row must be specified as column, row or filter'.
  2. 'Code: 409 / Status: Conflict / Start and end date or at least one period must be specified'

  Reviewing the XML of the favorites shows the period dimension is
  missing.

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