Fixes bug where null json value caused panic

[Fixes #82292538]

Signed-off-by: Bruno Alvisio <balvisio@mit.edu>
Add crypto/sha512 to import to solve unkown authority bug

[Fixes #82254112]

Signed-off-by: Derek Richard <drichard@pivotal.io>
Improve 'cf unset-org-role' error message on Access Denied (code 403)

[Finishes #77158010]

Signed-off-by: Tyler Schultz <tschultz@pivotal.io>