Querying EDR collections fails when first EdrParameter has no netcdf file

[mgrunbauer]

The /edr/collections endpoint fails if the data from the first configured EdrParameter is missing. The result is an HTTP 405 with the message Internal Server Error.

Querying the /edr/collections/<collection/instances/<instance>/position call directly does work.

Simplified example configuration:

<?xml version="1.0" encoding="UTF-8" ?>
<Configuration>
  <OgcApiFeatures/>
  <OgcApiEdr>
    <EdrCollection name="my_collection">
      <EdrParameter name="my_param1" unit="hPa"/>
      <EdrParameter name="my_param2" unit="C"/>
    </EdrCollection>
  </OgcApiEdr>

  <Layer type="database">
    <Name>my_param1</Name>
    (...)
  </Layer>

  <Layer type="database">
    <Name>my_param2</Name>
    (...)
  </Layer>
</Configuration>

In the above configuration, the /edr/collections call will fail if you only ingest data for my_param2.

I would expect that the /edr/collections call still works and (if possible) does not depend on the underlying data.