fix: fix type imcompatible (#2018)

Author: JackYPCOnline

src/strands/telemetry/tracer.py

@@ -839,7 +839,9 @@ def _add_system_prompt_event(
         if system_prompt is None and system_prompt_content is None:
             return
 
-        content_blocks = system_prompt_content if system_prompt_content else [{"text": system_prompt}]
+        content_blocks: list[ContentBlock] = (
+            system_prompt_content if system_prompt_content else [{"text": system_prompt or ""}]
+        )
 
         if self.use_latest_genai_conventions:
             parts = self._map_content_blocks_to_otel_parts(content_blocks)

tests_integ/models/test_model_mantle.py

@@ -88,10 +88,7 @@ def test_reasoning_content_multi_turn(client_args):
 
     # Verify reasoning content was produced
     has_reasoning = any(
-        "reasoningContent" in block
-        for msg in agent.messages
-        if msg["role"] == "assistant"
-        for block in msg["content"]
+        "reasoningContent" in block for msg in agent.messages if msg["role"] == "assistant" for block in msg["content"]
     )
     assert has_reasoning