My thought process is this: It isn't covered in the rules, nor the errata. That puts it firmly in GM call territory, which of course is an unhelpful answer. So all that will be set aside.
I'm torn between three ideas. I think magic targeting a person should always get a resistance roll. I'm also of the opinion that one should be a fan of the player characters. Finally, precedence.
Let me talk about precedence first. The Reinforce spell has been mentioned, and it seemingly does not need to overcome object resistance. On the flip side, increase gear limits does need to overcome object resistance. Two positive spells that effect items, totally different answers. Precedence is worthless (thanks catalyst).
At the end of the day I think I would probably allow the armor move once, with the understanding that after that, it would require overcoming object resistance. Likewise I would say beneficial spells grant a resistance roll. Finally, I would ask why we're not playing Shadowrun in the Sprawl, or 6th World or Karma in the Dark...
P.S. Objects can be subjects, not all subjects are objects.