Minor fixes.

src/ifcblenderexport/blenderbim/bim/import_ifc.py

@@ -1887,10 +1887,11 @@ class IfcImportSettings:
     @staticmethod
     def factory(context, input_file, logger):
         scene_bim = context.scene.BIMProperties
+        scene_diff = context.scene.DiffProperties
         settings = IfcImportSettings()
         settings.input_file = input_file
         settings.logger = logger
-        settings.diff_file = scene_bim.diff_json_file
+        settings.diff_file = scene_diff.diff_json_file
         settings.ifc_import_filter = scene_bim.ifc_import_filter
         settings.ifc_selector = scene_bim.ifc_selector
         settings.should_import_type_representations = scene_bim.import_should_import_type_representations

src/ifcblenderexport/blenderbim/bim/module/aggregate/ui.py

@@ -3,7 +3,7 @@ from blenderbim.bim.module.aggregate.data import Data
 
 
 class BIM_PT_aggregate(Panel):
-    bl_label = "IFC Aggregation"
+    bl_label = "IFC Aggregates"
     bl_idname = "BIM_PT_aggregate"
     bl_space_type = "PROPERTIES"
     bl_region_type = "WINDOW"
@@ -38,7 +38,7 @@ class BIM_PT_aggregate(Panel):
                 Data.products[props.ifc_definition_id]["type"], Data.products[props.ifc_definition_id]["Name"]
             )
             if name == "None/None":
-                name = "This object is not part of an aggregation"
+                name = "No Aggregate Found"
             row.label(text=name)
             row.operator("bim.enable_editing_aggregate", icon="GREASEPENCIL", text="")
             row.operator("bim.add_aggregate", icon="ADD", text="")

src/ifcblenderexport/blenderbim/bim/module/diff/prop.py

@@ -18,4 +18,3 @@ class DiffProperties(PropertyGroup):
     diff_old_file: StringProperty(default="", name="Diff Old IFC File")
     diff_new_file: StringProperty(default="", name="Diff New IFC File")
     diff_relationships: StringProperty(default="", name="Diff Relationships")
-    

src/ifcblenderexport/blenderbim/bim/module/geometry/ui.py

@@ -1,6 +1,7 @@
 import bpy
 from bpy.types import Panel
 from blenderbim.bim.module.geometry.data import Data
+from blenderbim.bim.ifc import IfcStore
 
 
 class BIM_PT_representations(Panel):
@@ -11,6 +12,10 @@ class BIM_PT_representations(Panel):
     bl_region_type = "WINDOW"
     bl_context = "object"
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file()
+
     def draw(self, context):
         layout = self.layout
         props = context.active_object.BIMObjectProperties

src/ifcblenderexport/blenderbim/bim/module/project/ui.py

@@ -23,7 +23,7 @@ class BIM_PT_project(Panel):
         props = context.scene.BIMProperties
         row = self.layout.row(align=True)
         row.label(text="IFC File", icon="FILE")
-        row.label(text=os.path.basename(props.ifc_file))
+        row.label(text=os.path.basename(props.ifc_file) or "No File Found")
 
         row = self.layout.row(align=True)
         row.label(text="IFC Schema", icon="FILE_CACHE")

src/ifcblenderexport/blenderbim/bim/module/void/ui.py

@@ -1,6 +1,7 @@
 import bpy
 from bpy.types import Panel
 from blenderbim.bim.module.void.data import Data
+from blenderbim.bim.ifc import IfcStore
 
 
 class BIM_PT_voids(Panel):
@@ -11,6 +12,10 @@ class BIM_PT_voids(Panel):
     bl_region_type = "WINDOW"
     bl_context = "object"
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file()
+
     def draw(self, context):
         props = context.active_object.BIMObjectProperties
         if props.ifc_definition_id not in Data.products:

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -944,7 +944,6 @@ class BIM_PT_mvd(Panel):
 
 class BIM_UL_generic(bpy.types.UIList):
     def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
-        ob = data
         if item:
             layout.prop(item, "name", text="", emboss=False)
         else: