Insertrow event gets called when composing mail and expanding contacts

[jiri-lunacek]

Insertrow event of this plugin gets triggered when in compose address book contacts are expanded.

This results in javascript error and termination of execution

Error:

message_label.js line 242
rcmail.env.messages is not an object

Hotfix is possible by adding

if (rcmail.env.messages == null) return;

on line 242, however this is not a proper fix as the event shoudl not be run in this case in the first place

[LeonardoRM]

I can also report the exact same issue.