FIX: Handle not existing fields with manual mapping

intelmq/bots/outputs/misp/output_feed.py

@@ -212,12 +212,13 @@ def _extract_misp_attribute_kwargs(self, message: dict, definition: dict) -> dic
 
     def _custom_mapping(self, obj: "MISPObject", message: dict):
         for object_relation, definition in self.attribute_mapping.items():
-            obj.add_attribute(
-                object_relation,
-                value=message[object_relation],
-                **self._extract_misp_attribute_kwargs(message, definition),
-            )
-            # In case of manual mapping, we want to fail if it produces incorrect values
+            if object_relation in message:
+                obj.add_attribute(
+                    object_relation,
+                    value=message[object_relation],
+                    **self._extract_misp_attribute_kwargs(message, definition),
+                )
+                # In case of manual mapping, we want to fail if it produces incorrect values
 
     def _generate_feed(self, message: dict = None):
         if message:

intelmq/tests/bots/outputs/misp/test_output_feed.py

@@ -149,6 +149,28 @@ def test_attribute_mapping(self):
         assert malware_name["value"] == EXAMPLE_EVENT["malware.name"]
         assert malware_name["comment"] == EXAMPLE_EVENT["extra.non_ascii"]
 
+    def test_attribute_mapping_empty_field(self):
+        self.run_bot(
+            parameters={
+                "attribute_mapping": {
+                    "source.ip": {},
+                    "source.fqdn": {},  # not exists in the message
+                }
+            }
+        )
+
+        current_event = open(f"{self.directory.name}/.current").read()
+        with open(current_event) as f:
+            objects = json.load(f).get("Event", {}).get("Object", [])
+
+        assert len(objects) == 1
+        attributes = objects[0].get("Attribute")
+        assert len(attributes) == 1
+        source_ip = next(
+            attr for attr in attributes if attr.get("object_relation") == "source.ip"
+        )
+        assert source_ip["value"] == "152.166.119.2"
+
     def test_event_separation(self):
         self.input_message = [
             EXAMPLE_EVENT,