Fix #4490. Fix fundamental bug where get_pset would return none for inherited props with a boolean False value.

src/blenderbim/blenderbim/tool/search.py

@@ -209,7 +209,7 @@ class ImportFilterQueryTransformer(lark.Transformer):
         return (
             is_not
             + {
-                "equals": "",  # Blank because it's the default situation
+                "equals": "=" if is_not else "",  # Blank because it's the default situation
                 "morethanequalto": ">=",
                 "lessthanequalto": "<=",
                 "morethan": ">",

src/ifcopenshell-python/ifcopenshell/util/element.py

@@ -93,13 +93,13 @@ def get_pset(
         elif qtos_only and not pset.is_a("IfcElementQuantity"):
             pset = None
 
-    if type_pset:
+    if type_pset is not None:
         if psets_only and not type_pset.is_a("IfcPropertySet"):
             type_pset = None
         elif qtos_only and not type_pset.is_a("IfcElementQuantity"):
             type_pset = None
 
-    if not pset and not type_pset:
+    if not pset and type_pset is None:
         return
 
     if not prop:

src/ifcopenshell-python/test/util/test_element.py

@@ -68,6 +68,9 @@ class TestGetPsetIFC4(test.bootstrap.IFC4):
         assert subject.get_pset(element, "name", "a") == 2
         assert subject.get_pset(element, "name", "x") == 1
         assert subject.get_pset(element, "name", "b") == 3
+        pset = ifcopenshell.api.run("pset.add_pset", self.file, product=type_element, name="name2")
+        ifcopenshell.api.run("pset.edit_pset", self.file, pset=pset, properties={"z": False})
+        assert subject.get_pset(element, "name2", "z") is False
 
     def test_excluding_inherited_psets(self):
         element = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")