Fixed a bug in coverage_changes.

 - Legacy-Id: 14037

Author: levkowetz

ietf/utils/management/commands/coverage_changes.py

@@ -145,7 +145,10 @@ def coverage_diff(self, master, latest, sections, release=None, **options):
                     p = -1
                     n = 0
                     for line in ndiff(mmisslines, lmisslines):
-                        n = lmissnum[ln]
+                        if ln < len(lmissnum):
+                            n = lmissnum[ln]
+                        else:
+                            n = mmissnum[mn]
                         prefix, text = line[:1], line[2:]
                         if mn<len(mmisslines) and text == mmisslines[mn]:
                             mn += 1