Fix bug where you couldn't delete a quantity from a quantity set

src/blenderbim/blenderbim/bim/module/pset/operator.py

@@ -192,6 +192,9 @@ class EditPset(bpy.types.Operator):
                 },
             )
         else:
+            for key, value in properties.items():
+                if isinstance(value, float):
+                    properties[key] = round(value, 4)
             ifcopenshell.api.run(
                 "pset.edit_qto",
                 self.file,

src/ifcopenshell-python/ifcopenshell/api/pset/edit_qto.py

@@ -32,9 +32,12 @@ class Usecase:
         if prop.Name not in self.settings["properties"]:
             return
         value = self.settings["properties"][prop.Name]
-        if prop.is_a("IfcPhysicalSimpleQuantity"):
+        name = prop.Name
-            prop[3] = float(value) if value else None
+        if value is None:
-        del self.settings["properties"][prop.Name]
+            self.file.remove(prop)
+        elif prop.is_a("IfcPhysicalSimpleQuantity"):
+            prop[3] = float(value)
+        del self.settings["properties"][name]
 
     def add_new_properties(self):
         properties = []