pyCharm inspection fixes. Mostly variable refernce issues

eos/db/__init__.py

@@ -62,6 +62,8 @@ if saveddata_connectionstring is not None:
     saveddata_meta = MetaData()
     saveddata_meta.bind = saveddata_engine
     saveddata_session = sessionmaker(bind=saveddata_engine, autoflush=False, expire_on_commit=False)()
+else:
+    saveddata_meta = None
 
 # Lock controlling any changes introduced to session
 sd_lock = threading.Lock()