Add committee memberships; tolerate empty EP declaration responses

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/roadmap.md

@@ -33,6 +33,7 @@ Next.js frontend (de/en), Docker Compose for Unraid.
       party/institution channels; curated `social_accounts.yaml`
 - [x] X deletion sync (`social.x_deletions`): posts gone from X keep a marked record without their text
 - [x] EP final roll-call votes of Austrian MEPs (`europarl.votes`)
+- [x] Committee memberships of the configured legislative periods (list 250, `parlament.persons`)
 - [x] Draft legal pages (`/impressum`, `/datenschutz`), corrections contact, portrait proxy (`/api/img`)
 - [x] Pages: organisations, money explorer, social feed, Wikipedia edits, person network ("follow the money"),
       say-vs-vote on roll calls
@@ -46,7 +47,7 @@ Next.js frontend (de/en), Docker Compose for Unraid.
 ## Next
 
 **Data**
-- [ ] Full speech texts and interjections from the protocols; committee memberships (list 250)
+- [ ] Full speech texts and interjections from the protocols
 - [ ] EU Council participant lists, ministries' press releases, Federal President's schedule
 - [ ] Election results and candidate lists; AMA/TAM subsidy recipients (after checking bulk access and terms)
 - [ ] Cabinet staff and appointments to state-owned companies (from answers to parliamentary questions)

docs/sources.md

@@ -31,6 +31,7 @@ Status: ✅ implemented (adapter name in `code`) · 🟡 planned · ⛔ delibera
 | Source | Data | Access | Licence / terms | Status |
 |---|---|---|---|---|
 | Parlament Österreich | MPs since 1918, mandates, functions, **side jobs & income category** (§6 Unv-Transparenz-G), social-media links, plenary speeches, **faction votes** per item and reading | JSON API (`/Filter/api/filter/data/409,101,251`, `?json=TRUE` detail pages) | [CC BY 4.0](https://www.parlament.gv.at/recherchieren/open-data/daten-und-lizenz/) | ✅ `parlament.persons`, `parlament.items` |
+| – committee memberships | who sat on which committee, with function and dates | JSON API (`/Filter/api/filter/data/250`) | CC BY 4.0 | ✅ `parlament.persons` |
 | – stenographic protocols | **Roll-call votes**: every member's yes/no from the "Mit „Ja“/„Nein“ stimmten …" lists | HTML fragments | CC BY 4.0 | ✅ `parlament.items` |
 | – immunity waivers | prosecutors' requests to lift immunity: authority, offence, outcome | items + committee report | CC BY 4.0 | ✅ `parlament.items` |
 | – written questions and answers | who asked which minister what | item list (J / AB) | CC BY 4.0 | ✅ `parlament.items` |