provider: RSA: Fix get_params to retrieve max-size, bits, and security-bits

[ifranzki]

The RSA key management's get_params() function should be able to return the values for max-size, bits, and security-bits if at least the public key is available.

The detection wheter the key is 'empty', i.e. has neither the public nor the private key components was wrong. This lead to the fact that those parameters were not returned when only the public key was available.

[ifranzki]

close/reopen to trigger travis

[jschmidb]

lgtm, just 2 typos in commit msg: The detection wheter (<- whether) the key is 'empty', i.e. has neither the public nor the private key components was wrong. This lead (<- leads) to the fact that

[ifranzki]

fixed typos in commit msg, no code change.