Removed unnecessary blank lines from perm_groups.py

sympy/combinatorics/perm_groups.py

@@ -605,7 +605,6 @@ def basic_stabilizers(self):
 
         """
 
-
         if self._coset_repr == []:
             self.schreier_sims()
         strong_gens = self._strong_gens
@@ -834,7 +833,6 @@ def schreier_sims(self):
         self._transversals = transversals
         self._basic_orbits = basic_orbits
 
-
     def coset_decomposition(self, g):
         """
         Decompose `g` as h_0*...*h_{len(u)}
@@ -1581,7 +1579,6 @@ def is_subgroup(self, gr):
                 return False
         return True
 
-
     def __ne__(self, gr):
         return not self == gr
 
@@ -2031,7 +2028,6 @@ def max_div(self):
                 self._max_div = d
                 return d
 
-
     def is_primitive(self, randomized=True):
         """
         Test a group for primitivity.
@@ -2409,6 +2405,7 @@ def baseswap(self, base, strong_gens, pos, randomized=True,\
                 strong_gens_new.append(gen)
         return base_new, strong_gens_new
 
+
 def DirectProduct(*groups):
     """
     Returns the direct product of several groups as a permutation group.