Fix array diffing.
diff --git a/scripts/jsondiff.py b/scripts/jsondiff.py
index 03e25e3..458fef3 100755
--- a/scripts/jsondiff.py
+++ b/scripts/jsondiff.py
@@ -202,11 +202,11 @@
             for i in range(max(len(a), len(b))):
                 try:
                     ae = a[i]
-                except KeyError:
+                except IndexError:
                     ae = None
                 try:
                     be = b[i]
-                except KeyError:
+                except IndexError:
                     be = None
                 self.dumper._indent()
                 if comparer.visit(ae, be):