Remove crash

theano/compile/debugmode.py

@@ -1939,10 +1939,10 @@ class _Linker(gof.link.LocalLinker):
                                 if r not in fgraph.inputs]
 
         # Precompute some things for storage pre-allocation
-        try:
-            def_val = int(config.unittests.rseed)
-        except ValueError:
-            def_val = 666
+        # Need this import here to prevent circular import.
+        # If we don't do it, we won't always configuration available.
+        import theano.tests.unittest_tools  # noqa
+        def_val = int(config.unittests.rseed)
 
         #####
         # This is the function that runs when you evaluate the graph