Render PopupAnnotations even if they have missing or empty /Rect-entries (issue 15012, PR 14439 follow-up)

This only applies to *corrupt* PDF documents, where Annotations are missing the required /Rect-entry. Rendering PopupAnnotations unconditionally shouldn't be a problem, since we're not using a `BaseSVGFactory`-instance in that case.

test/pdfs/.gitignore

@@ -507,6 +507,7 @@
 !xfa_issue14315.pdf
 !poppler-67295-0.pdf
 !poppler-85140-0.pdf
+!issue15012.pdf
 !poppler-395-0-fuzzed.pdf
 !GHOSTSCRIPT-698804-1-fuzzed.pdf
 !issue14814.pdf

test/test_manifest.json

@@ -4951,6 +4951,13 @@
        "type": "eq",
        "forms": true
     },
+    {  "id": "issue15012",
+       "file": "pdfs/issue15012.pdf",
+       "md5": "cc5e89507262cb3ec6862f68cb3eefd1",
+       "rounds": 1,
+       "type": "eq",
+       "annotations": true
+    },
     {  "id": "gesamt",
       "file": "pdfs/gesamt.pdf",
       "md5": "743aaa6f46ed0a42864f079d632d942e",