attempt to fix problem if stats are empty in formatNm

Signed-off-by: Julien Veyssier <eneiluj@posteo.net>

modules/awk.py

@@ -14,8 +14,9 @@ def formatNm(bas, topoToHruTmpPath, topoBflTmpPath, stats):
             # group stats by second column value
             for stat in stats:
                 statSpl = stat.strip().split()
-                second = statSpl[2]
-                statDict[second].append(statSpl)
+                if len(statSpl) > 2:
+                    second = statSpl[2]
+                    statDict[second].append(statSpl)
 
             # one value = one result line with accumulated values
             for sec in statDict: