Test Gaia.query_object with columns and radius

Currently the `astroquery.gaia.core.GaiaClass.query_object()` method
ignores the `column` argument if `radius` is specified. This commit adds
a remote test that reveals the problem.

Author: eerovaher

astroquery/gaia/tests/test_gaia_remote.py

@@ -5,6 +5,15 @@
 from .. import GaiaClass
 
 
+@pytest.mark.remote_data
+def test_query_object_columns_with_radius():
+    # Regression test: `columns` were ignored if `radius` was provided [#2025]
+    Gaia = GaiaClass()
+    sc = SkyCoord(ra=0*u.deg, dec=0*u.deg)
+    table = Gaia.query_object_async(sc, radius=10*u.arcsec, columns=['ra'])
+    assert table.colnames == ['ra', 'dist']
+
+
 @pytest.mark.remote_data
 def test_query_object_row_limit():
     Gaia = GaiaClass()