Auth code flow while waiting for response throws the error handle them properly

[talwinder50]

          @DRK3  There are multiple error that comes from sdk while we are waiting for request credential to issue the credential. I noticed it takes few second and then, like data not found etc comes from sdk while we are waiting for call to complete so, I will create a separate issue to look into more detail into this.

Originally posted by @talwinder50 in https://github.com/trustbloc/wallet-sdk/pull/520#discussion_r1279770257