accrual: Outgoing report uses first rt-id as primary ticket number.

This makes it consistent with the reporting and our general rule
that the first link is primary.

conservancy_beancount/reports/accrual.py

@@ -508,7 +508,12 @@ class OutgoingReport(BaseReport):
         self.rt_wrapper = rtutil.RT(rt_client)
 
     def _primary_rt_id(self, posts: AccrualPostings) -> rtutil.TicketAttachmentIds:
-        rt_ids = posts.all_meta_links('rt-id')
+        rt_ids: Set[str] = set()
+        for post in posts:
+            try:
+                rt_ids.add(post.meta.get_links('rt-id')[0])
+            except (IndexError, TypeError):
+                pass
         rt_ids_count = len(rt_ids)
         if rt_ids_count != 1:
             raise ValueError(f"{rt_ids_count} rt-id links found")

setup.py

@@ -5,7 +5,7 @@ from setuptools import setup
 setup(
     name='conservancy_beancount',
     description="Plugin, library, and reports for reading Conservancy's books",
-    version='1.1.3',
+    version='1.1.4',
     author='Software Freedom Conservancy',
     author_email='info@sfconservancy.org',
     license='GNU AGPLv3+',

tests/books/accruals.beancount

@@ -108,7 +108,7 @@
   Liabilities:Payable:Accounts  -60.00 USD
 
 2010-06-18 * "EuroGov" "European legal fees"
-  rt-id: "rt:520"
+  rt-id: "rt:520 rt:525"
   invoice: "rt:520/5200"
   contract: "rt:520/5220"
   Liabilities:Payable:Accounts  -1,000 EUR {1.100 USD}