fix: gracefully handle invalid indicator names in tool calls (#429)

tradingagents/agents/utils/technical_indicators_tools.py

@@ -23,9 +23,10 @@ def get_indicators(
     # LLMs sometimes pass multiple indicators as a comma-separated string;
     # split and process each individually.
     indicators = [i.strip() for i in indicator.split(",") if i.strip()]
-    if len(indicators) > 1:
     results = []
     for ind in indicators:
+        try:
             results.append(route_to_vendor("get_indicators", symbol, ind, curr_date, look_back_days))
+        except ValueError as e:
+            results.append(str(e))
     return "\n\n".join(results)
-    return route_to_vendor("get_indicators", symbol, indicator.strip(), curr_date, look_back_days)