Another attempt at test fix...

tests/test_metadata_roundtrips_via_simulation.py

@@ -56,6 +56,7 @@ def inception():
 @pytest.mark.parametrize("pop", [{"N": 100, "L": 1}], indirect=["pop"])
 def test_metadata_roundtrip_single_sim(rng, pdict, pop):
     import sys
+
     params = fwdpy11.ModelParams(**pdict)
 
     r = fwdpy11.RandomAncientSamples(seed=42, samplesize=2, timepoints=[3])
@@ -64,12 +65,11 @@ def test_metadata_roundtrip_single_sim(rng, pdict, pop):
 
     ts = pop.dump_tables_to_tskit()
 
-    # add neutral mutations w/no metadata
-    ts = msprime.mutate(ts, rate=1.0, random_seed=654321)
-
-    # bulk decode the mutation metadata, which is all None
     if sys.version_info.minor > 6:
         # FIXME: this is a hack to avoid the test failing with msprime < 1.0
+        # add neutral mutations w/no metadata
+        ts = msprime.mutate(ts, rate=1.0, random_seed=654321)
+        # bulk decode the mutation metadata, which is all None
         mutation_md = fwdpy11.tskit_tools.decode_mutation_metadata(ts.tables)
         assert all([i is None for i in mutation_md])