This gets rid of TypeError messages, but does not appear to affect behaviour
qrc:///qml/DiveDetailsEdit.qml:254: TypeError: Cannot read property 'dive' of null
qrc:///qml/DiveDetailsEdit.qml:228: TypeError: Cannot read property 'dive' of null
qrc:///qml/DiveDetailsEdit.qml:216: TypeError: Cannot read property 'dive' of null
qrc:///qml/DiveDetailsEdit.qml:204: TypeError: Cannot read property 'dive' of null
Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>