Fix a bug that prevents events with targetEntityType and targetEntity…

[EmergentOrder]

…Id set from being returned by find from PPythonEventStore

[microvnn]

shell> pio-shell --with-pyspark
Here code:

from pypio.pypio import init, find_events, save_model
init()
event_df = find_events('MY_TEXT')
event.show()
+--------------------+-----+----------+--------+----------------+--------------+--------------------+----+----+--------------------+------+
| eventId|event|entityType|entityId|targetEntityType|targetEntityId| eventTime|tags|prId| creationTime|fields|
+--------------------+-----+----------+--------+----------------+--------------+--------------------+----+----+--------------------+------+
|4ee1b81b73aa40b99...| $set| user| 4| null| null|2019-08-28 02:29:...| |null|2019-08-28 02:29:...| Map()|
|81b5a43e153041d58...| $set| user| 4| null| null|2019-08-28 02:46:...| |null|2019-08-28 02:46:...| Map()|
+--------------------+-----+----------+--------+----------------+--------------+--------------------+----+----+--------------------+------+

Problem: function "find_events" only get $set,$unset,$delete events

[EmergentOrder]

@microvnn I can't reproduce this, I get all events.