add debug print

Author: Jeffrey Whitaker

test/test_fancyslicing.py

@@ -144,6 +144,7 @@ def test_get(self):
 
         # slicing with all False booleans (PR #1197)
         iby[:] = False
+        print(ibx,iby,ibz)
         data = v[ibx,iby,ibz]
         assert data.size == 0