cmds.projects.CmdGetAuthInfo: Fix: echo credentials "None"

get-auth-info() reads the origin URL of the jw-pkg repository and reports
its username and password. Uri.username and Uri.password are None for URLs
without a credentials part, but _run() stored them in the result anyway, so
--username --only-values printed the literal string "None" for such URLs.

The bootstrap Makefile derives JANWARE_USER from exactly that output on its
second parse, after the jw-pkg directory has been cloned from an anonymous
https origin whose URL has no user part. JANWARE_USER thus became the
string "None", pgit.sh is invoked with --login None and --refspec
None:current-branch:current-branch, and queries the Forgejo API for the
repositories of a non-existent "None" org, so every anonymous bootstrap
fails with "Failed to enumerate repositories".

Make _run() only record values that are not None, so missing credentials
produce no output instead of the string "None".

Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.87.0
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/projects/CmdGetAuthInfo.py

@@ -79,7 +79,9 @@ class CmdGetAuthInfo(Cmd):  # export
             ]:  # TODO: Use other remotes, too?
                 parsed = Uri(url)
                 for key in keys:
-                    result[key] = getattr(parsed, key)
+                    val = getattr(parsed, key)
+                    if val is not None:
+                        result[key] = val
                 base = parsed.to_string
                 base = re.sub(r'/jw-pkg', '', base)
                 base = re.sub(r'/proj$', '', base)