New issue 750: Test failure for Profile1D https://bitbucket.org/yt_analysis/yt/issue/750/test-failure-for-profile1d Kacper Kowalik: Reduced test case: ``` #!python from yt.testing import fake_random_pf from yt.data_objects.profiles import Profile1D pf = fake_random_pf(64, nprocs=8, fields=("Density", "Temperature")) nv = pf.domain_dimensions.prod() dd = pf.h.all_data() (rmi, rma), (tmi, tma) = dd.quantities["Extrema"](["Density", "Temperature"]) p1d = Profile1D(dd, "Density", 8, rmi * 0.9, rma * 1.1, False, weight_field=None) p1d.add_fields(["Ones", "Temperature"]) ``` yields: ``` #!bash Traceback (most recent call last): File "issue.py", line 9, in <module> p1d.add_fields(["Ones", "Temperature"]) File "yt/data_objects/profiles.py", line 760, in add_fields for g in parallel_objects(self.data_source._grids): File "yt/utilities/parallel_tools/parallel_analysis_interface.py", line 433, in parallel_objects oiter = itertools.islice(enumerate(objects), my_new_id, None, njobs) TypeError: 'NoneType' object is not iterable ```