Removing blankline at the end of the file W391.

Author: tscrim

src/sage/algebras/q_commuting_polynomials.py

@@ -667,4 +667,3 @@ def __invert__(self):
                 ret.set_immutable()
                 return P.term(ret, ~c * q**-qpow)
             return super().__invert__()
-