cubicweb-email #2754310 dbapi changes in cw 3.16 broke mboximport [deprecated]

File "/usr/share/cubicweb/cubes/email/ccplugin.py", line 62, in connect
cnx = config_connect(appid, self.config)

ends up with AttributeError("'CubicWebNoAppConfiguration' object has no attribute 'appid'",)

prioritynormal
typebug
done in<not specified>
load0.000
load left0.000
closed by<not specified>