feat: add error in case of non-available informative dataframe

freqtrade/strategy/informative_decorator.py

@@ -133,6 +133,11 @@ def _create_and_merge_informative_pair(
 
     inf_metadata = {"pair": asset, "timeframe": timeframe}
     inf_dataframe = strategy.dp.get_pair_dataframe(asset, timeframe, candle_type)
+    if inf_dataframe.empty:
+        raise ValueError(
+            f"Informative dataframe for ({asset}, {timeframe}, {candle_type}) is empty. "
+            "Can't populate informative indicators."
+        )
     inf_dataframe = populate_indicators_fn(strategy, inf_dataframe, inf_metadata)
 
     formatter: Any = None

tests/strategy/test_strategy_helpers.py

@@ -380,9 +380,10 @@ def test_informative_decorator(mocker, default_conf_usdt, trading_mode):
         assert inf_pair in strategy.gather_informative_pairs()
 
     def test_historic_ohlcv(pair, timeframe, candle_type):
-        return data[
-            (pair, timeframe or strategy.timeframe, CandleType.from_string(candle_type))
-        ].copy()
+        return data.get(
+            (pair, timeframe or strategy.timeframe, CandleType.from_string(candle_type)),
+            pd.DataFrame(),
+        ).copy()
 
     mocker.patch(
         "freqtrade.data.dataprovider.DataProvider.historic_ohlcv", side_effect=test_historic_ohlcv
@@ -405,3 +406,12 @@ def test_informative_decorator(mocker, default_conf_usdt, trading_mode):
     for _, dataframe in analyzed.items():
         for col in expected_columns:
             assert col in dataframe.columns
+
+    # Test non-available pairs
+    del data[("ETH/BTC", "1h", CandleType.SPOT)]
+    with pytest.raises(
+        ValueError, match=r"Informative dataframe for \(ETH\/BTC, 1h, spot\) is empty.*"
+    ):
+        strategy.advise_all_indicators(
+            {p: data[(p, strategy.timeframe, candle_def)] for p in ("XRP/USDT", "LTC/USDT")}
+        )