Hive visitor: hascoordinate and spatial_issues are now implemented using specific hive columns
Boolean columns are excluded from null checking
Merge branch 'master' of https://github.com/gbif/occurrence

# By Oliver Meyn
# Via Oliver Meyn
* 'master' of https://github.com/gbif/occurrence:
  adds Continent as a solr search param
  add the check for no spatial issues back to featured occ reader
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