added sane check for line lenght

check_mk-informix/checks/informix_transactions

@@ -26,6 +26,8 @@ def parse_informix_transactions(info):
             entry = {}
             parsed.setdefault(instance, [])
             parsed[instance].append(entry)
+            ###in some cases, for some transaction lines there is no info, only a timestamp that should be ignored
+            if len(line) > 2:
                 if "C" in line[2]:
                     entry.setdefault("current_log_id", line[3])
                 elif entry is not None: