Fix loading of sessions if no run has occurred (agno-agi#3084)

## Summary

If a run has not yet happened, then the session in memory would not
exist, but it could still exist in the DB. This avoids the agent
failing.

Fixes agno-agi#3078 

## Type of change

- [x] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Improvement
- [ ] Model update
- [ ] Other:

---

## Checklist

- [ ] Code complies with style guidelines
- [ ] Ran format/validation scripts (`./scripts/format.sh` and
`./scripts/validate.sh`)
- [ ] Self-review completed
- [ ] Documentation updated (comments, docstrings)
- [ ] Examples and guides: Relevant cookbook examples have been included
or updated (if applicable)
- [ ] Tested in clean environment
- [ ] Tests added/updated (if applicable)

---

## Additional Notes

Add any important context (deployment instructions, screenshots,
security considerations, etc.)

Author: dirkbrnd

libs/agno/agno/agent/agent.py

@@ -2261,7 +2261,7 @@ def get_agent_session(self, session_id: str, user_id: Optional[str] = None) -> A
             else:
                 self.memory = cast(Memory, self.memory)
                 # We fake the structure on storage, to maintain the interface with the legacy implementation
-                run_responses = self.memory.runs[session_id]  # type: ignore
+                run_responses = self.memory.runs.get(session_id, [])  # type: ignore
                 memory_dict = self.memory.to_dict()
                 memory_dict["runs"] = [rr.to_dict() for rr in run_responses]
         else:

libs/agno/agno/team/team.py

@@ -909,7 +909,7 @@ def _run(
             self._make_memories_and_summaries(run_messages, session_id, user_id)
 
             session_messages: List[Message] = []
-            for run in self.memory.runs[session_id]:  # type: ignore
+            for run in self.memory.runs.get(session_id, []):  # type: ignore
                 if run.messages is not None:
                     for m in run.messages:
                         session_messages.append(m)
@@ -1270,7 +1270,7 @@ def _run_stream(
             self._make_memories_and_summaries(run_messages, session_id, user_id)
 
             session_messages: List[Message] = []
-            for run in self.memory.runs[session_id]:  # type: ignore
+            for run in self.memory.runs.get(session_id, []):  # type: ignore
                 if run.messages is not None:
                     for m in run.messages:
                         session_messages.append(m)
@@ -1699,7 +1699,7 @@ async def _amake_memories_and_summaries(run_messages: RunMessages, session_id: s
             )
 
             session_messages: List[Message] = []
-            for run in self.memory.runs[session_id]:
+            for run in self.memory.runs.get(session_id, []):
                 for m in run.messages:
                     session_messages.append(m)
 
@@ -2078,7 +2078,7 @@ async def _amake_memories_and_summaries(run_messages: RunMessages, session_id: s
             )
 
             session_messages: List[Message] = []
-            for run in self.memory.runs[session_id]:  # type: ignore
+            for run in self.memory.runs.get(session_id, []):  # type: ignore
                 if run.messages is not None:
                     for m in run.messages:
                         session_messages.append(m)