Amended "if data" checks in FileModel to "if data?"
Amended "if data" checks in FileModel to "if data?"

Signed-off-by: Richard Antecki <320bca71fc381a4a025636043ca86e734e31cf8b@antecki.id.au>

JonathanMatthey/nikeprototyper,JonathanMatthey/nikeprototyper,JonathanMatthey/nikeprototyper