scripts/test_list: Do not stop the build if documentation fails

Current approach stops whole build process on a case that there is mistake
on documentation. Let's have entry on logs instead and continue.

Small fix also related multiline data e.g. on Description part.

Signed-off-by: Jari Tahvanainen <jari.tahvanainen@intel.com>
Signed-off-by: Karthik B S <karthik.b.s@intel.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>