Don't fail if one of the hardcoded negative indexes does not exist

This fixes the corner case where a tag set includes one year or less - the
list would not have an entry at index -2 (or -1 if no papers have the tag).

1 files changed, 7 insertions, 4 deletions

diff --git a/writeHTML.py b/writeHTML.py
index 19a7c14..2a3d455 100755
--- a/writeHTML.py
+++ b/writeHTML.py
@@ -162,10 +162,13 @@ def writePageSet(config, bib, tag):
     entries = BibTeX.sortEntriesByDate(bib_entries)
     entries = BibTeX.splitSortedEntriesBy(entries, 'year')
     for idx in -1, -2:
-        if entries[idx][0].startswith("<span class='bad'>"):
-            entries[idx] = ("Unknown", entries[idx][1])
-        elif entries[idx][0].startswith("forthcoming"):
-            entries[idx] = ("Forthcoming", entries[idx][1])
+        try:
+            if entries[idx][0].startswith("<span class='bad'>"):
+                entries[idx] = ("Unknown", entries[idx][1])
+            elif entries[idx][0].startswith("forthcoming"):
+                entries[idx] = ("Forthcoming", entries[idx][1])
+        except IndexError:
+            continue
     sections = [ ent[0] for ent in entries ]
 
     first_year = int(entries[0][1][0]['year'])