[EN-1791] fixed get_dataframe

Author: iamishalkin

dxfeed/core/utils/data_class.py

@@ -46,4 +46,4 @@ def safe_get(self, keep: bool=True):
                 self.clear()
         finally:
             self.lock.release()
-        return list(list_to_return)
+        return list(list_to_return)

dxfeed/core/utils/handler.pyx

@@ -60,7 +60,7 @@ cdef class DefaultHandler(EventHandler):
         event: list
             List of various data specific to certain event type.
         """
-        self.__data.safe_append(event)
+        self.__data.safe_append(*event)
 
     def get_list(self, keep: bool=True):
         """