fix: when cudatoolkit not found the v will return as None type

[samthakur587]

PR types

Bug fixes

PR changes

APIs

Description

while checking the env info if cuda toolkit not installed then paddle not able to make it on cpu default. the v value is returned as Nonetype and after that you wil get error for doing the calculation on nonetype value.

/home/server2/anaconda3/envs/paddleseg/lib/python3.10/site-packages/paddle/base/framework.py:688: UserWarning: You are using GPU version Paddle, but your CUDA device is not set properly. CPU device will be used by default.
  warnings.warn(
W0902 10:47:30.370355 1513691 dynamic_loader.cc:314] The third-party dynamic library (libcudnn.so) that Paddle depends on is not configured correctly. (error code is /usr/local/cuda/lib64/libcudnn.so: cannot open shared object file: No such file or directory)
  Suggestions:
  1. Check if the third-party dynamic library (e.g. CUDA, CUDNN) is installed correctly and its version is matched with paddlepaddle you installed.
  2. Configure third-party dynamic library environment variables as follows:
  - Linux: set LD_LIBRARY_PATH by `export LD_LIBRARY_PATH=...`
  - Windows: set PATH by `set PATH=XXX;
Traceback (most recent call last):
  File "/home/server2/Documents/paddleseg/PaddleSeg/tools/train.py", line 211, in <module>
    main(args)
  File "/home/server2/Documents/paddleseg/PaddleSeg/tools/train.py", line 152, in main
    utils.show_env_info()
  File "/home/server2/anaconda3/envs/paddleseg/lib/python3.10/site-packages/paddleseg/utils/utils.py", line 38, in show_env_info
    env_info = get_sys_env()
  File "/home/server2/anaconda3/envs/paddleseg/lib/python3.10/site-packages/paddleseg/utils/env/sys_env.py", line 103, in get_sys_env
    v = str(v // 1000) + '.' + str(v % 1000 // 100)
TypeError: unsupported operand type(s) for //: 'NoneType' and 'int'

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