Fix 5140

src/utils.py

@@ -954,9 +954,8 @@ def get_label_pno(pgNo, labels):
     Returns:
         The label (str) of the page number. Errors return an empty string.
     """
-    # Jorj McKie, 2021-01-06
-
-    item = [x for x in labels if x[0] <= pgNo][-1]
+    l = [x for x in labels if x[0] <= pgNo]
+    item = (pgNo, "") if not l else l[-1]
     rule = rule_dict(item)
     prefix = rule.get("prefix", "")
     style = rule.get("style", "")

tests/test_5140.py

@@ -0,0 +1,19 @@
+import pymupdf
+
+
+def test_5140():
+    doc = pymupdf.open()
+    doc.new_page()
+    doc.new_page()
+    doc.set_page_labels(
+        [
+            {
+                "startpage": 1,
+                "prefix": "",
+                "firstpagenum": 1,
+                "style": "D",
+            }
+        ]
+    )
+    assert doc[0].get_label() == ""  # IndexError: list index out of range
+    assert doc[1].get_label() == "1"