Camera: pass null data jpeg callback for the application to resume
preview

- When takePicture is called from application, application will be waiting
  for jpeg callback to restore preview.
- When get picture fails at lower layers, give a jpeg callback with null
  data so that the application will resume preview and ready for next
  operations.

Change-Id: Ib49169bfa54201c570ae4688730b2bece40bf9f6
2 files changed