Interpret empty annotation border as [0, 0, 0]

It fixes #20914.

Author: calixteman

src/core/annotation.js

@@ -1104,14 +1104,18 @@ class Annotation {
       }
     } else if (borderStyle.has("Border")) {
       const array = borderStyle.getArray("Border");
-      if (Array.isArray(array) && array.length >= 3) {
-        this.borderStyle.setHorizontalCornerRadius(array[0]);
-        this.borderStyle.setVerticalCornerRadius(array[1]);
-        this.borderStyle.setWidth(array[2], this.rectangle);
-
-        if (array.length === 4) {
-          // Dash array available
-          this.borderStyle.setDashArray(array[3], /* forceStyle = */ true);
+      if (Array.isArray(array)) {
+        if (array.length >= 3) {
+          this.borderStyle.setHorizontalCornerRadius(array[0]);
+          this.borderStyle.setVerticalCornerRadius(array[1]);
+          this.borderStyle.setWidth(array[2], this.rectangle);
+
+          if (array.length === 4) {
+            // Dash array available
+            this.borderStyle.setDashArray(array[3], /* forceStyle = */ true);
+          }
+        } else if (array.length === 0) {
+          this.borderStyle.setWidth(0);
         }
       }
     } else {

test/pdfs/issue20914.pdf.link

@@ -0,0 +1 @@
+https://github.com/user-attachments/files/26097319/SiemensTest.PDF

test/test_manifest.json

@@ -14020,5 +14020,13 @@
     "rounds": 1,
     "link": true,
     "type": "eq"
+  },
+  {
+    "id": "issue20914",
+    "file": "pdfs/issue20914.pdf",
+    "md5": "5740b4600e40c6fc920d38f96a74c6a5",
+    "rounds": 1,
+    "link": true,
+    "type": "eq"
   }
 ]