Hack around missing dependency library when testing for deprecation

Author: bsipocz

astroquery/vamdc/tests/test_vamdc_remote.py

@@ -28,4 +28,4 @@ def test_query_molecule(self):
 
 def test_deprecation():
     with pytest.warns(AstropyDeprecationWarning):
-        vamdc.Vamdc()
+        vamdc.Vamdc(doimport=False)