AnniversariesGramplet: import WindowActiveError

[eduralph]

Summary

AnniversariesGramplet/AnniversariesGramplet.py:103 references WindowActiveError in an except clause but never imports it. Ruff (rule F821) flags this:

F821 Undefined name `WindowActiveError`
   --> AnniversariesGramplet/AnniversariesGramplet.py:103:20
    |
101 |                 event = self.dbstate.db.get_event_from_handle(handle)
102 |                 EditEvent(self.dbstate, self.uistate, [], event)
103 |             except WindowActiveError:
    |                    ^^^^^^^^^^^^^^^^^
104 |                 pass
    |

The exception is raised by gramps.gui.editors.EditEvent when the editor is already open for the same handle; WindowActiveError lives in gramps.gen.errors. Without the import, the except clause would trigger NameError if an editor were already open — a real (if rare) runtime bug masked today only because that path is uncommon.

Fix

Add the missing import alongside the other gramps.gen.* imports:

 from gramps.gen.config import config
+from gramps.gen.errors import WindowActiveError
 from gramps.gui.editors import EditEvent

One-line change, no behavioural impact under normal use; fixes the NameError on the active-editor path.

Verification

• ruff check --select=E9,F63,F7,F82 --no-fix --exclude='*.gpr.py' AnniversariesGramplet/ → "All checks passed!" (was 1 F821).
• python3 -m py_compile AnniversariesGramplet/AnniversariesGramplet.py exits 0.
• Sweep across the entire addons-source tree confirms exactly one F821 was removed (from 78 → 77 sites) — no other addon affected.

Scope

Per addons-source convention, one PR per addon directory. This is the first of an upstream-friendly per-addon series clearing the lint backlog (the same set PR #820's body originally enumerated). Each subsequent PR will be similarly minimal and addon-scoped.

🤖 Generated with Claude Code

[eduralph]

@GaryGriffin - this is the first of 70 linting issues found in 27 add-ons. I didn't want to dump it all on you right away and happy to space it out the way you would like best. alternatively, I can do all 26 PRs at one go and you can merge as you see fit.

[GaryGriffin]

I am fine with 26 more PRs. I will also cherry pick each to gramps61. I may not wait my traditional week before merging.