app list blank error if not logged in

[itowlson]

Hippo CLI built from current HEAD, Hippo as installed by the installer. When I do hippo app list and am not logged in, I get Error: with no error message.

$ ./target/debug/hippo app list
Error:

$ ./target/debug/hippo login
Enter username: ivan
Enter password: [hidden]
Logged in as ivan

$ ./target/debug/hippo app list
[
  {
    "id": "ef57e3cf-0145-49f4-b6e1-66cf77b40b3d",
    "name": "spin-hello-world",
# etc

[bacongobbler]

duplicate of #105