fix: disconnect with nullptr receiver

OpenBoard-org / OpenBoard

OpenBoard is a cross-platform interactive whiteboard application intended for use in a classroom setting.

https://openboard.ch/

GNU General Public License v3.0

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Closed letsfindaway closed 2 months ago

letsfindaway commented 3 months ago

When starting OpenBoard, there was the following warning:

QObject::disconnect: Unexpected nullptr parameter

This PR fixes this.