Slice dynamic accessors ignore Quote for equities

- Slice dynamic data accessors will ignore QuoteBars and
Ticks TickType.QuoteBars for equities. This is to make slice dynamic
accessors deterministic and avoid breaking backwards compatibility when
adding QuoteBars for equities.

Algorithm.Python/ConvertToFrameworkAlgorithm.py

@@ -58,7 +58,7 @@ class ConvertToFrameworkAlgorithm(QCAlgorithm):
         Args:
             data: Slice object with your stock data'''
         # wait for our indicator to be ready
-        if not self.macd.IsReady or data[self.symbol] is None: return
+        if not self.macd.IsReady or not data.ContainsKey(self.symbol) or data[self.symbol] is None: return
 
         holding = self.Portfolio[self.symbol]