Fix NoneType error when user has no subscription

g.subscription is explicitly set to None in load_user, so
g.get("subscription", {}) returns None (key exists), not {}.
Use (g.get(...) or {}) to coalesce None to an empty dict.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/beanflows/dashboard/routes.py

@@ -97,7 +97,7 @@ async def index():
     """Coffee analytics dashboard."""
     user = g.user
     stats = await get_user_stats(g.user["id"])
-    plan = g.get("subscription", {}).get("plan", "free")
+    plan = (g.get("subscription") or {}).get("plan", "free")
 
     # Fetch all analytics data in parallel (empty lists if DB not available)
     if analytics._conn is not None:
@@ -144,7 +144,7 @@ async def index():
 async def countries():
     """Country comparison page."""
     user = g.user
-    plan = g.get("subscription", {}).get("plan", "free")
+    plan = (g.get("subscription") or {}).get("plan", "free")
 
     # Get available countries for coffee
     all_countries = await analytics.get_top_countries(analytics.COFFEE_COMMODITY_CODE, "Production", limit=50)