Fix exception handling in tutorial colab.
"# Import dm_control if it exists.\n",
"try:\n",
" from dm_control import suite\n",
- "except ModuleNotFoundError, OSError:\n",
+ "except (ModuleNotFoundError, OSError):\n",
" pass\n",
"\n",
"# Set up a virtual display for rendering OpenAI gym environments.\n",
