OPT: isct_test_function: no more print if function crashes (too messy)
OPT: isct_test_function: no more print if function crashes (too messy)

Former-commit-id: e7cc11f1f65edec4e7caff3eeed2b6c9dfb0ace0
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox