WM: avoid Python exceptions in poll functions

scripts/startup/bl_operators/geometry_nodes.py

@@ -40,7 +40,8 @@ def geometry_modifier_poll(context):
 
 
 def get_context_modifier(context):
-    if context.area.type == 'PROPERTIES':
+    area = context.area
+    if (area is not None) and (area.type == 'PROPERTIES'):
         modifier = context.modifier
     else:
         ob = context.object

scripts/startup/bl_operators/image.py

@@ -178,12 +178,8 @@ class ProjectApply(Operator):
 
     def execute(self, _context):
         image_name = ProjectEdit._proj_hack[0]  # TODO, deal with this nicer
-
-        try:
-            image = bpy.data.images[image_name, None]
-        except KeyError:
-            import traceback
-            traceback.print_exc()
+        image = bpy.data.images.get((image_name, None))
+        if image is None:
             self.report({'ERROR'}, tip_("Could not find image '%s'") % image_name)
             return {'CANCELLED'}
 

scripts/startup/bl_operators/object.py

@@ -655,6 +655,11 @@ class IsolateTypeRender(Operator):
     bl_label = "Restrict Render Unselected"
     bl_options = {'REGISTER', 'UNDO'}
 
+    @classmethod
+    def poll(cls, context):
+        ob = context.object
+        return (ob is not None)
+
     def execute(self, context):
         act_type = context.object.type