[tests/plots] added dummy test for pycmbs/plots.py
[tests/plots] added dummy test for pycmbs/plots.py


Former-commit-id: 606f71f17cef08ca6faa6337cfc441862728d2c8
Former-commit-id: c4e6e431f51e86e82ae3ae3c2f9c4c543b65566e
pygeo/pycmbs,pygeo/pycmbs