src/sage/symbolic/integration/integral.py: fix giac integral output

Now that libgiac is being used for "giac" integrals, one test is
printing out "No checks were made for singular points of
antiderivative -1/sageVARx for definite integration in [1,+infinity]"
where previously the test was silent. We now "..." the junk away.

src/sage/symbolic/integration/integral.py

@@ -212,7 +212,9 @@ def __init__(self):
             sage: ex = 1/max_symbolic(x, 1)**2
             sage: integral(ex, x, 0, 2, algorithm='giac')
             3/2
-            sage: integral(1/max_symbolic(x, 1)**2, x, 0, oo, algorithm='giac')
+            sage: result = integral(1/max_symbolic(x, 1)**2, x, 0, oo, algorithm='giac')
+            ...
+            sage: result
             2
         """
         # The automatic evaluation routine will try these integrators