[checkerboard_detector] Hot fix for multisense camera info

It's a hot fix for malformed multisense camera_info.

Already reported it [here](https://bitbucket.org/crl/multisense_ros/issue/29/r-and-k-of-camera-parameter-is-zero).

```
$ rostopic echo /multisense/left/camera_info -n 1
header: 
  seq: 28297
  stamp: 
    secs: 1418992371
    nsecs: 622231000
  frame_id: /multisense/left_camera_optical_frame
height: 1024
width: 1024
distortion_model: ''
D: []
K: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
R: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
P: [582.4236450195312, 0.0, 524.5, 0.0, 0.0, 582.4236450195312, 505.0, 0.0, 0.0, 0.0, 1.0, 0.0]
binning_x: 0
binning_y: 0
roi: 
  x_offset: 0
  y_offset: 0
  height: 0
  width: 0
  do_rectify: False
---
```