replace settings=None with {}

src/ifcopenshell-python/ifcopenshell/api/pset_template/edit_prop_template.py

@@ -1,5 +1,5 @@
 class Usecase:
-    def __init__(self, file, settings=None):
+    def __init__(self, file, settings={}):
         self.file = file
         self.settings = {"prop_template": None, "attributes": {}}
         for key, value in settings.items():

src/ifcopenshell-python/ifcopenshell/api/pset_template/edit_pset_template.py

@@ -1,5 +1,5 @@
 class Usecase:
-    def __init__(self, file, settings=None):
+    def __init__(self, file, settings={}):
         self.file = file
         self.settings = {"pset_template": None, "attributes": {}}
         for key, value in settings.items():

src/ifcopenshell-python/ifcopenshell/api/pset_template/remove_prop_template.py

@@ -2,7 +2,7 @@ import ifcopenshell.util.element
 
 
 class Usecase:
-    def __init__(self, file, settings=None):
+    def __init__(self, file, settings={}):
         self.file = file
         self.settings = {
             "prop_template": None

src/ifcopenshell-python/ifcopenshell/api/pset_template/remove_pset_template.py

@@ -2,7 +2,7 @@ import ifcopenshell.util.element
 
 
 class Usecase:
-    def __init__(self, file, settings=None):
+    def __init__(self, file, settings={}):
         self.file = file
         self.settings = {
             "pset_template": None