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**Bugfixes**
- Main portion of Emily class tried to get session variables before user had session variables, which returns '{}'. When this happens, the default_session_vars and starting_node settings are ignored. Added default_session_vars parameter to sessions.get_session_vars() so that when a session doesn't exist yet, Emily creates a new one with the default session variables.
- self.already_started in the Emily() class was not initialized under some circumstances. Now self.already_started begins as True, and is set to False if Emily is not already started.