fix: README test

The README test previously failed because the iteration over the
auxiliary operator observables in the ElectronicStructureResult is
currently unable to handle the lack of certain properties which have
always been evaluated for legacy reasons (AngularMomentum,
Magnetization).
Even if we were to default them to an empty list instead of None, while
the zip command would execute normally, no results would be printed
since zip stops after the shortest length.

That being said, fixing ElectronicStructureResult is not the solution
right now in any case, since a user would be unable to manually request
the computation of AngularMomentum and Magnetization before we resolve
the issue ý¿¿¼£�#312
Thus, this commit reverts the exclusion of these auxiliary operators in
the case of `settings.dict_aux_operators`.

qiskit_nature/drivers/second_quantization/pyquanted/pyquantedriver.py

@@ -24,7 +24,6 @@
 
 from qiskit_nature import QiskitNatureError
 from qiskit_nature.constants import BOHR, PERIODIC_TABLE
-from qiskit_nature.settings import settings
 from qiskit_nature.properties.second_quantization.driver_metadata import DriverMetadata
 from qiskit_nature.properties.second_quantization.electronic import (
     ElectronicStructureDriverResult,
@@ -406,9 +405,11 @@ def _construct_driver_result(self) -> ElectronicStructureDriverResult:
         self._populate_driver_result_particle_number(driver_result)
         self._populate_driver_result_electronic_energy(driver_result)
 
-        if not settings.dict_aux_operators:
-            driver_result.add_property(AngularMomentum(self._nmo * 2))
-            driver_result.add_property(Magnetization(self._nmo * 2))
+        # TODO: once https://github.com/Qiskit/qiskit-nature/issues/312 is fixed we can stop adding
+        # these properties by default.
+        # if not settings.dict_aux_operators:
+        driver_result.add_property(AngularMomentum(self._nmo * 2))
+        driver_result.add_property(Magnetization(self._nmo * 2))
 
         return driver_result
 

qiskit_nature/drivers/second_quantization/pyscfd/pyscfdriver.py

@@ -23,7 +23,6 @@
 import numpy as np
 from qiskit.utils.validation import validate_min
 
-from qiskit_nature.settings import settings
 from qiskit_nature.properties.second_quantization.driver_metadata import DriverMetadata
 from qiskit_nature.properties.second_quantization.electronic import (
     ElectronicStructureDriverResult,
@@ -518,9 +517,11 @@ def _construct_driver_result(self) -> ElectronicStructureDriverResult:
         self._populate_driver_result_electronic_energy(driver_result)
         self._populate_driver_result_electronic_dipole_moment(driver_result)
 
-        if not settings.dict_aux_operators:
-            driver_result.add_property(AngularMomentum(self._mol.nao * 2))
-            driver_result.add_property(Magnetization(self._mol.nao * 2))
+        # TODO: once https://github.com/Qiskit/qiskit-nature/issues/312 is fixed we can stop adding
+        # these properties by default.
+        # if not settings.dict_aux_operators:
+        driver_result.add_property(AngularMomentum(self._mol.nao * 2))
+        driver_result.add_property(Magnetization(self._mol.nao * 2))
 
         return driver_result