skip test when scipy is not there.

theano/sandbox/linalg/tests/test_linalg.py

@@ -536,6 +536,8 @@ class test_Eigh_float32(test_Eigh):
     dtype = 'float32'
 
 def test_matrix_inverse_solve():
+    if not imported_scipy:
+        raise SkipTest("Scipy needed for the Solve op.")
     A = theano.tensor.dmatrix('A')
     b = theano.tensor.dmatrix('b')
     node = matrix_inverse(A).dot(b).owner