Trailing comma of a patched namelist.

[marshallward]

When a key-value pair of a namelist group is patched, the comma is removed rather than preserving any existing commas.

Namelist a.nml:

&test_nml
    x = 1,
    y = 2,
    z = 3,
/

Runscript:

import f90nml

nml = f90nml.read('a.nml')
patch = {'test_nml': {'y': 2}}
f90nml.patch('a.nml', patch, 'b.nml')

Output:

&test_nml
    x = 1,
    y = 2
    z = 3,
/

This was previously reported in #111

[marshallward]

I just noticed this is an older issue (#105) that has already been reported, so will close this one.