add try catch to solve the problem 'NoSuchConfiException' in virtual screen #148
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If we use a system without desktop, and run the script in examples, it will raise an exception: "NoSuchConfigException"
(In file f1tenth_gym/gym/f110_gym/envs/rendering.py, conf = Config(sample_buffers........)
and this PR will fix this, just use a default config so we can use the virtual screen by setting DISPLAY=:0