Remove CAS image after test
The test tests/datamodel/metainfo/eln/test_system.py::test_substance left an SVG file (cas_10101-63-0_image.svg) after processing.
This MR removes the image at the end of the test, thereby also checking if it existed.
The test tests/datamodel/metainfo/eln/test_system.py::test_substance left an SVG file (cas_10101-63-0_image.svg) after processing.
This MR removes the image at the end of the test, thereby also checking if it existed.