[XASObjectViewer] add baseline plot optional regarding the silx version

4 jobs for update_0_2 in 4 minutes and 43 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed test:python3.5-stretch-pyqt5_larch #45936

00:02:35

passed test:python3.5-stretch-pyqt5_pymca #45935

00:04:29

passed test:python3.5-stretch-pyqt5_pymca_larch #45937

00:04:43

passed test:test-xas-tutorials_pymca #45938

00:03:20