fix tool parser (#7167)

Author: luukunn

fastdeploy/entrypoints/openai/tool_parsers/ernie_45_vl_thinking_tool_parser.py

@@ -245,10 +245,6 @@ def extract_tool_calls_streaming(
         if self.valid is not None and not self.valid:
             return DeltaMessage(content=delta_text)
 
-        # Skip empty chunks
-        if len(delta_text.strip()) == 0:
-            return None
-
         try:
             delta = None
             # Use buffer to accumulate delta_text content