Fix parsing for empty ~Other section

[dcslagel]

Description:

This change addresses "Correctly reading a LAS file with an empty ~Other" section #417

Changes

• This change prevents ~Other parsing from reading ~ASCII data
  So if the ~Other section is empty in the las file it will be empty in
  the internal las structure.
• Test case added: test_read_v2_sample_empty_other_section

Test Results

No change:

Name                       Stmts   Miss  Cover
----------------------------------------------
lasio/__init__.py             13      2    85%
lasio/convert_version.py      20     20     0%
lasio/defaults.py             11      0   100%
lasio/examples.py             42     10    76%
lasio/excel.py                88     34    61%
lasio/exceptions.py            6      0   100%
lasio/las.py                 409     59    86%
lasio/las_items.py           199     31    84%
lasio/las_version.py          50     14    72%
lasio/reader.py              396     25    94%
lasio/writer.py              175     10    94%
----------------------------------------------
TOTAL                       1409    205    85%

--

Let me know if this change could be accepted (or rejected) or
needs some additional changes to be approved and merged.

Thank you,
DC

[kinverarity1]

Thanks!