IMU sensor doesn't get exported

[Daniel Angelov]

Describe the bug
Create a link, joint and add an IMU sensor to the link.
Export to SDF.
Resulting SDF doesn't contain the IMU sensor.

Expected behavior
The SDF to have the sensor IMU tag.

[Henning Wiedemann]

Hi @23pointsNorth ,
please check whether c9f5bec solves this issue

[Henning Wiedemann]

I consider this as closed.