make false_easting and false_northing optional
this second part fixes the visualization of the lambert conformal grid in psyplot#38 (closed). The current implementation assumed the false_easting
and false_northing
attributes to be mandatory, although they should be optional.
-
Tests added (for all bug fixes or enhancements) -
Tests passed (for all non-documentation changes) -
Fully documented, including CHANGELOG.rst
for all changes