Update recordpubli to improve find_affiliation algorithm.

modules/invenio_tools/recordpubli.py

@@ -396,13 +396,13 @@ class RecordPubli(Record):
         """
         df = self["authors"]
 
-        # modify the pattern to capture group
-        pattern = "(%s)" % pattern
+        query = df.affiliation.str.match(pattern)
+        data = df[query]
 
-        data = (df.affiliation.str.extract(pattern, expand=False)
-                .dropna()
-                .unique())
+        if data.empty:
+            return ""
 
+        data = data.affiliation.unique()
         return (data[0] if len(data) > 0 else "")
 
     def find_authors(self, pattern, sep=", ", sort=False):