haloinfo broken for DM only runs

[dnarayanan]

see example below:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[1], line 1
----> 1 obj.haloinfo()

File /blue/narayanan/desika.narayanan/conda/envs/py38/lib/python3.8/site-packages/caesar-0.2b0-py3.8-linux-x86_64.egg/caesar/loader.py:366, in CAESAR.haloinfo(self, top)
    365 def haloinfo(self, top=10):
--> 366     info_printer(self, 'halo', top)

File /blue/narayanan/desika.narayanan/conda/envs/py38/lib/python3.8/site-packages/caesar-0.2b0-py3.8-linux-x86_64.egg/caesar/utils.py:152, in info_printer(obj, group_type, top)
    150 for o in group_list:
    151     cgsm = -1
--> 152     if (hasattr(o,'central_galaxy')) & (hasattr(o.central_galaxy,'masses')): cgsm = o.central_galaxy.masses['stellar']
    153     output += ' %04d  %0.2e  %0.2e  %0.2e  %0.2e  %0.2e\t|  %0.2e \n' % \
    154               (o.GroupID, o.masses['dm'], o.masses['stellar'],
    155                o.masses['gas'],o.radii['total_half_mass'],
    156                o.local_number_density['1000'], cgsm)
    157     cnt += 1

File /blue/narayanan/desika.narayanan/conda/envs/py38/lib/python3.8/site-packages/caesar-0.2b0-py3.8-linux-x86_64.egg/caesar/loader.py:527, in Halo.__getattr__(self, attr)
    523 if attr in self.obj._halo_dicts:
    524     return LazyDict(
    525         self.obj._halo_dicts[attr].keys(),
    526         lambda d: self.obj._halo_dicts[attr][d][self._index])
--> 527 raise AttributeError("'{}' object as no attribute '{}'".format(
    528     self.__class__.__name__, attr))

AttributeError: 'Halo' object as no attribute 'central_galaxy'