Added corner case tests.

theano/tensor/tests/test_basic.py

@@ -930,7 +930,10 @@ DotTester = makeTester(name = 'DotTester',
                                     complex1 = (randcomplex(5, 7), randcomplex(7)),
                                     complex2 = (rand(5, 7), randcomplex(7)),
                                     complex3 = (randcomplex(5, 7), rand(7)),
-                                    empty = (numpy.asarray([]),numpy.asarray([])),),
+                                    empty1 = (numpy.asarray([]),numpy.asarray([])),
+                                    empty2 = (rand(5,0),rand(0,2)),
+                                    empty3 = (rand(0,5),rand(5,0)),
+                                    ),
                         bad_build = dict(),
                         bad_runtime = dict(bad1 = (rand(5, 7), rand(5, 7)),
                                            bad2 = (rand(5, 7), rand(8, 3))))