suppress ugly tracebacks at Ctrl+C

freqtrade/optimize/hyperopt.py

@@ -398,6 +398,7 @@ class CustomImmediateResultBackend(LokyBackend):
         Use it to run Optimizer.tell() with immediate results of the backtest()
         evaluated in the joblib worker process.
         """
+        if not result.exception():
             # Fetch results from the Future object passed to us.
             # Future object is assumed to be 'done' already.
             f_val = result.result().copy()