Adding regression test for null results

Author: bsipocz

astroquery/sha/tests/test_sha_remote.py

@@ -0,0 +1,16 @@
+import pytest
+
+from astropy.table import Table
+
+from astroquery import sha
+from astroquery.exceptions import NoResultsWarning
+
+
+@pytest.mark.remote_data
+def test_query_no_results():
+    # Test for issue #1836
+    with pytest.warns(NoResultsWarning):
+        result = sha.query(ra=219.57741, dec=64.171525, size=0.001)
+
+    assert isinstance(result, Table)
+    assert len(result) == 0