#14772 Python: GridCaseGroup.compute_statistics() treats an empty case_ids list as all cases

The legacy computeCaseGroupStatistics command could not distinguish an unset list from an
empty one, so [] meant all statistics cases. Keep that in the deprecation shim.

GrpcInterface/Python/rips/gridcasegroup.py

@@ -64,7 +64,7 @@ def compute_statistics(self, case_ids=None):
     statistics case (see statistics_cases()) instead.
 
     Arguments:
-        case_ids(list of integers): List of case ids. If this is None all cases in group are included
+        case_ids(list of integers): List of case ids. If this is None or empty all cases in group are included
 
     """
     warnings.warn(
@@ -73,5 +73,5 @@ def compute_statistics(self, case_ids=None):
         stacklevel=3,
     )
     for statistics_case in self.statistics_cases():
-        if case_ids is None or statistics_case.id in case_ids:
+        if not case_ids or statistics_case.id in case_ids:
             statistics_case.compute_statistics(update_views=True)

GrpcInterface/Python/rips/tests/test_project.py

@@ -100,6 +100,15 @@ def test_statistics_case_object_methods(rips_instance, initialize_test):
     with pytest.warns(DeprecationWarning):
         grid_case_group.compute_statistics(case_ids=[stat_case.id])
 
+    # An empty list means all statistics cases in the group, as in the legacy command
+    empty_case = grid_case_group.create_statistics_case(populate_result_selection=False)
+    empty_case.set_source_properties("DYNAMIC_NATIVE", ["SWAT"])
+    with pytest.warns(DeprecationWarning):
+        grid_case_group.compute_statistics(case_ids=[])
+    assert "SWAT_MEAN" in empty_case.available_properties(
+        rips.PropertyType.DYNAMIC_NATIVE
+    )
+
 
 def test_replace_source_cases(rips_instance, initialize_test):
     case_paths = [