Merge branch 'major-testing' into major

# Conflicts:
#	tests/actions/test_activity_actions.py
#	tests/actions/test_database_actions.py
#	tests/actions/test_method_actions.py
#	tests/conftest.py
#	tests_old/legacy/test_settings.py
#	tests_old/legacy/test_uncertainty.py
#	tests_old/legacy/test_utils.py
#	tests_old/legacy/test_widgets.py
#	tests_old/widgets/test_custom_allocation_editor.py
#	tests_old/widgets/test_property_editor.py
#	tests_old/widgets/test_tag_editor.py
#	tests_old/wizards/test_export_wizard.py
#	tests_old/wizards/test_import_wizard.py
#	tests_old/wizards/test_uncertainty_wizard.py

Author: mrvisscher

activity_browser/bwutils/metadata.py

@@ -105,7 +105,7 @@ def on_node_changed(self, new, old):
 
     @property
     def databases(self):
-        return set(self.dataframe["database"].unique())
+        return set(self.dataframe.get("database").unique())
 
     def sync_node(self, key: tuple) -> None:
         """Update metadata when an activity has changed.

activity_browser/layouts/pages/activity_details/exchanges_tab.py

@@ -582,7 +582,7 @@ def displayData(self, col: int, key: str):
                 "normalize": False,
             }
 
-        if key.startswith("property_") and self[key]["normalize"]:
+        if key.startswith("property_") and self[key].get("normalize", True):
             prop = self[key].copy()
             prop["unit"] = prop['unit'] + f" / {self['unit']}"
             return prop