tmf: Fix NullPointerExeptions in Histogram view
These NPEs happens when clicking or dragging the mouse in the
histogram windows before any data is available in the scaled data
instance.
Change-Id: I57efdb03cd53e2198580fa6c0ed047fc2dc4c3ac
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/19268
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>
IP-Clean: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Hudson CI
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