utils/pdf: do not crash on field without a /Rect (#75698)

passerelle/utils/pdf.py

@@ -38,6 +38,8 @@ class Rect(typing.NamedTuple):
 
     @classmethod
     def from_pdf_annotation(cls, annotation):
+        if not annotation.Rect:
+            raise ValueError('annotation has no rect')
         return cls(*map(float, annotation.Rect))
 
 
@@ -120,14 +122,23 @@ class Widget:
 
     @property
     def rect(self):
-        return self.rects[0]
+        rects = self.rects
+        return self.rects[0] if rects else Rect(9999, 9999, 9999, 9999)
 
     @property
     def rects(self):
+        annotations = []
         if self.widget_type == 'radio':
-            return [Rect.from_pdf_annotation(kid) for kid in self.kids_ordered_by_rect]
+            annotations = self.kids_ordered_by_rect
         else:
-            return [Rect.from_pdf_annotation(self.annotation)]
+            annotations = [self.annotation]
+        rects = []
+        for annotation in annotations:
+            try:
+                rects.append(Rect.from_pdf_annotation(annotation))
+            except ValueError:
+                pass
+        return rects
 
     @property
     def digest_id(self):