Fixed FutureWarning regarding the use of GeoDataFrame and GeoSeries for data...

Fixed FutureWarning regarding the use of GeoDataFrame and GeoSeries for data without geopandas geometry (switched to plain pandas classes).

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
5 jobs for master in 23 minutes and 8 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #49869
test_gms_preprocessing

00:09:56

63.0%
passed #49870
test_gms_preprocessing_install

00:12:36

passed #49871
test_styles

00:00:20

 
  Deploy
passed #49872
pages

00:00:14

passed pages:deploy

00:00:01