feat(llm): convert function call request for non-funcall OSS model (#4711)

Co-authored-by: Calvin Smith <email@cjsmith.io>

openhands/controller/agent_controller.py

@@ -12,6 +12,7 @@ from openhands.controller.state.state import State, TrafficControlState
 from openhands.controller.stuck import StuckDetector
 from openhands.core.config import AgentConfig, LLMConfig
 from openhands.core.exceptions import (
+    FunctionCallValidationError,
     LLMMalformedActionError,
     LLMNoActionError,
     LLMResponseError,
@@ -478,7 +479,12 @@ class AgentController:
             action = self.agent.step(self.state)
             if action is None:
                 raise LLMNoActionError('No action was returned')
-        except (LLMMalformedActionError, LLMNoActionError, LLMResponseError) as e:
+        except (
+            LLMMalformedActionError,
+            LLMNoActionError,
+            LLMResponseError,
+            FunctionCallValidationError,
+        ) as e:
             self.event_stream.add_event(
                 ErrorObservation(
                     content=str(e),