object: Warn if constructing an unregistered object inheriting from GObject
This partially reverts commit 974560a2, which reverted commit 90da0497. This brings back the check but as a warning instead of an exception.
Closes #288 (closed)
This partially reverts commit 974560a2, which reverted commit 90da0497. This brings back the check but as a warning instead of an exception.
Closes #288 (closed)