Show chgrp target tree if Projects OR Datasets exist. See #10917

[will-moore]

To test, choose to move an Image to a group that only has Datasets (no Projects). The chgrp dialog should present this list of Datasets (Previously just showed 'No Projects'). Pick a Dataset and check the chgrp puts the image in that Dataset.

[mtbc]

Good to merge.

[gusferguson]

@will-moore

Testing with Web client on gretzky 5.0.0-alpha4-436-879a315-dirty-ice33-b308 user-2 private-1 and read-only-1 Mac Safari

Testing move image from read-only-1 to private-1 group which had only datasets in it.
Datasets appeared as expected in dialog.
Dialogue appeared correctly - able to select and move image to the 2 datasets there successfully - behaves as expected.

When tried moving image without selecting one of the 2 datasets - expecting it to go to orphaned - Activity menu reported:
"Move to Group 'private-1'
STEP ERR step: 0, stack trace:"
Image moved without selecting a dataset disappeared from original group but does not appear in Orphaned.
On refresh image reappears in original group.
Repeated with same result.

Bug ticket filed:
https://trac.openmicroscopy.org.uk/ome/ticket/11118