Display alert in the popup No disks are selected in pool Resize.
Replace hard code for error message display for pool resize if no disks are selected.
Display appropriate error when no disks are selected when we try to resize pool.
Change alert to display requestResponse.
Merge pull request #97 from Mchakravartula/issue#84_pool_resize

Display alert in the popup when No disks are selected in pool Resize.