Fix crash when the config value wasn't evaluated.

theano/configparser.py

@@ -126,6 +126,8 @@ def _config_print(thing, buf):
     for cv in _config_var_list:
         print >> buf, cv
         print >> buf, "    Doc: ", cv.doc
+        if not hasattr(cv, 'val'):
+            cv.__get__()
         print >> buf, "    Value: ", cv.val
         print >> buf, ""
 
@@ -140,6 +142,9 @@ def get_config_md5():
     """
     all_opts = sorted([c for c in _config_var_list if c.in_c_key],
                       key=lambda cv: cv.fullname)
+    for opt in all_opts:
+        if not hasattr(opt, 'val'):
+            opt.__get__()
     return theano.gof.cc.hash_from_code('\n'.join(
                     ['%s = %s' % (cv.fullname, cv.val) for cv in all_opts]))