FIX: Import CAD with None value in control file (#6436)

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: Samuelopez-ansys

doc/changelog.d/6436.fixed.md

@@ -0,0 +1 @@
+Import cad with none value in control file

src/ansys/aedt/core/hfss3dlayout.py

@@ -1373,7 +1373,7 @@ def _import_cad(
             project_name = generate_unique_name(project_name)
             aedb_path = aedb_path.replace(old_name, project_name)
             self.logger.warning("aedb_exists. Renaming it to %s", project_name)
-        if not Path(xml_path):
+        if xml_path is None:
             xml_path = Path("")
         elif Path(xml_path).suffix == ".tech":
             xml_path = Path(tech_to_control_file(xml_path))