FEATURE: Support null footprints from component def (#349)

Co-authored-by: drewm102 <[email protected]>

src/ansys/edb/core/definition/component_def.py

@@ -25,7 +25,7 @@ def create(cls, db, comp_def_name, fp):
         comp_def_name : str
             Name of the component definition to create.
         fp : :class:`Cell <ansys.edb.core.layout.Cell>`
-            Footprint cell of the component definition.
+            Footprint cell of the component definition, optional
 
         Returns
         -------

src/ansys/edb/core/inner/messages.py

@@ -460,7 +460,10 @@ def inst_array_creation_message(layout, name, ref, orig, xaxis, yaxis, xcount, y
 
 def component_def_creation_message(db, comp_name, fp):
     """Convert to a ``ComponentDefCreateMessage`` object."""
-    return ComponentDefCreateMessage(db=db.msg, comp_name=comp_name, fp=fp.msg)
+    if fp is None:
+        return ComponentDefCreateMessage(db=db.msg, comp_name=comp_name, fp=None)
+    else:
+        return ComponentDefCreateMessage(db=db.msg, comp_name=comp_name, fp=fp.msg)
 
 
 def transform_message(transform):