Shorter (#1582)

* deleting lines

* remove insert dims

* if statement is never hit

* bug fixes

test/test_symbolic_jit.py

@@ -149,4 +149,7 @@ class TestSymbolicJit(unittest.TestCase):
     a = Tensor.rand(3, 7).reshape(3, vi)
     bad = Tensor.rand(4, 7).reshape(4, vi)
     with self.assertRaises(AssertionError):
-      add(a, bad)
+      add(a, bad)
+
+if __name__ == '__main__':
+  unittest.main()