Adjusted loading of paleogeography subsystem

Author: davenquinn

cli/macrostrat/cli/subsystems/paleogeography/__init__.py

@@ -3,11 +3,15 @@
 
 from typer import Context, Typer
 
-from ...database import get_db
 from .corelle import build_carto_plate_index, create_corelle_fixtures
+from ...database import get_db
 
 
 def load_paleogeography_subsystem(app, main, db_subsystem):
+    if app.settings.pg_database is None:
+        print("No database configured, skipping corelle subsystem", file=stderr)
+        return app
+
     try:
         environ["CORELLE_DB"] = app.settings.pg_database
         from corelle.engine import cli as corelle_cli