Allow stackup thickness and area weight to be None (#873)

When the fabrics in a stackup do have a material, or the stackup
has no fabrics, the 'thickness' and 'area_weight' properties
cannot be computed. This change allows these properties to be
'None' in these cases.
This case is only supported in the 26.1 server version or later.
Earlier versions would raise an error when getting the properties
under these conditions.

Author: greschd

poetry.lock

@@ -39,7 +39,7 @@ numpy = ">=1.22"
 grpcio-health-checking = ">=1.43"
 packaging = ">=15.0"
 typing-extensions = ">=4.5.0"
-ansys-api-acp = "==0.3.0"
+ansys-api-acp = "==0.3.1"
 ansys-tools-path = ">=0"
 ansys-tools-local-product-launcher = ">=0.1"
 ansys-tools-filetransfer = ">=0.1"

pyproject.toml

@@ -222,8 +222,12 @@ def _create_stub(self) -> stackup_pb2_grpc.ObjectServiceStub:
 
     locked: ReadOnlyProperty[bool] = grpc_data_property_read_only("properties.locked")
     status = grpc_data_property_read_only("properties.status", from_protobuf=status_type_from_pb)
-    thickness: ReadOnlyProperty[float] = grpc_data_property_read_only("properties.thickness")
-    area_weight: ReadOnlyProperty[float] = grpc_data_property_read_only("properties.area_weight")
+    thickness: ReadOnlyProperty[float] = grpc_data_property_read_only(
+        "properties.thickness", check_optional=True
+    )
+    area_weight: ReadOnlyProperty[float] = grpc_data_property_read_only(
+        "properties.area_weight", check_optional=True
+    )
 
     symmetry = grpc_data_property(
         "properties.symmetry",

src/ansys/acp/core/_tree_objects/stackup.py

@@ -190,9 +190,22 @@ def test_add_fabric(parent_object):
     assert stackup.fabrics[-1].angle == 45.0
 
 
-def test_fabric_wit_angle(parent_object):
+def test_fabric_with_angle(parent_object):
     fabric1 = parent_object.create_fabric()
     fabric_with_angle = FabricWithAngle(fabric=fabric1, angle=45.0)
     assert fabric_with_angle != FabricWithAngle(fabric=parent_object.create_fabric(), angle=45.0)
     assert fabric_with_angle != FabricWithAngle(fabric=fabric1, angle=55.0)
     assert fabric_with_angle == FabricWithAngle(fabric=fabric1, angle=45.0)
+
+
+def test_fabric_without_material(parent_object, skip_before_version):
+    """Verify that a fabric without material can be added to a stackup.
+
+    Checks that the properties which should not be computable are 'None'.
+    """
+    skip_before_version("26.1")
+    fabric = parent_object.create_fabric()
+    stackup = parent_object.create_stackup()
+    stackup.add_fabric(fabric)
+    assert stackup.thickness is None
+    assert stackup.area_weight is None