Fix darker suggestions

Author: charity-g

package/MDAnalysis/analysis/atomicdistances.py

@@ -108,7 +108,6 @@
 
 """
 
-
 import numpy as np
 
 from MDAnalysis.lib.distances import calc_bonds

testsuite/MDAnalysisTests/analysis/test_atomicdistances.py

@@ -123,7 +123,6 @@ def test_ad_pairwise_dist(self, ad_ag1, ad_ag2, expected_dist):
         pairwise_no_pbc = ad.AtomicDistances(ad_ag1, ad_ag2, pbc=False).run()
         actual = pairwise_no_pbc.results
         assert isinstance(actual, Results)
-        
         distances = actual.distances
         # compare with expected values from dist()
         assert_allclose(distances, expected_dist)
@@ -134,7 +133,6 @@ def test_ad_pairwise_dist_pbc(self, ad_ag1, ad_ag2, expected_pbc_dist):
         pairwise_pbc = ad.AtomicDistances(ad_ag1, ad_ag2).run()
         actual = pairwise_pbc.results
         assert isinstance(actual, Results)
-
         distances = actual.distances
         # compare with expected values from dist()
         assert_allclose(distances, expected_pbc_dist)