Add guards to check numberFormat and type arguments to constructors
for null. This prevents failures with NPE later when the field is
used.

Change-Id: I50c8b7d9062bc8236a48dd113531f5285080fb59
Signed-off-by: Justin Kuenzel <java@jukusoft.com>
Also-by: Karsten Thoms <karsten.thoms@itemis.de>
Also-by: Jens Lidestrom <jens@lidestrom.se>