MaterialItem.MaterialList is nullable

[pmattmann]

No description provided.

[carlobeltrame]

When is it expected to be null?

[pmattmann]

When is it expected to be null?

thx.
For new Root-ContentNodes, getRoot() returns null.
Fixed the check.

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[BacLuc]

The following api tests would be nice:

CreateActivityTest:
copy an activity from another camp -> materiallist is null
copy an activity from another camp, and then copy it again in the same camp
copy an activity from another camp, and then copy it to a third camp

[BacLuc]

The following test would be nice:
update a materialitem with a null material list

-> if you set the materiallist to not null -> success
-> if you change another property and leave the materiallist null -> error
-> if you change the material list from null to a material list of another camp -> error

[carlobeltrame]

I see, so this is an improvement for e.g. copying activities with material from one camp to another.
In that case, do the prints and the material content node handle a null material list well? And can we add some items with null material list to the dev data?