Fixed an issue where plot_pfss()-method would crash with reference_lo…

[Christian-Palmroos]

…n==int(0). Also fixed a minor bug where pfss_table would display the latitudinal separation between reference and the Earth as the Earth's magnetic footpoint if no reference latitude was given.

[Christian-Palmroos]

This pull request is a fix to issue #94.

[jgieseler]

Also fixed a minor bug where pfss_table would display the latitudinal separation between reference and the Earth as the Earth's magnetic footpoint if no reference latitude was given.

But now this is only fixed for the latitude; the longitude still shows the old behavior, right? And that would be crashing, because

ref_earth_sep_lon = earth_footpoint[0] - self.reference_long if earth_footpoint[0] - self.reference_long < 180 else earth_footpoint[0] - self.reference_long - 360

will cause a TypeError: unsupported operand type(s) for -: 'float' and 'NoneType' if self.reference_long is None.

[Christian-Palmroos]

No, it will not, because that line is never executed if self.reference_long == None. This is checked on line 1449, while ref_earth_sep_lon is determined on line 1450.