caching_backend: small bugfixes

python/nomadcore/caching_backend.py

 import json
 import numpy as np
 import sys
+import logging
 from nomadcore import parser_backend
 
 class CachingLevel(object):
@@ -116,7 +117,7 @@ class CachingSectionManager(object):
                     superSect.addSubsection(self.metaInfo, toClose)
                 else:
                     backend.storeToClosedSuper(superName, superGIndex, self.metaInfo, toClose)
-            if toClose.references.isEmpty:
+            if not toClose.references: # checks for empty list
                 backend.parsingSession.addSubsection(self.metaInfo, toClose)
         if self.forwardOpenClose and backend.superBackend:
             backend.superBackend.closeSection(self.metaInfo.name, gIndex)
@@ -144,7 +145,7 @@ class CachingSectionManager(object):
             gI = self.lastSectionGIndex
         else:
             gI = gIndex
-        self.openSections[gI].setArrayValues(valueMetaInfo, value, gIndex)
+        self.openSections[gI].setArrayValues(valueMetaInfo, value, offset)
 
     def addArrayValues(self, valueMetaInfo, value, offset = None, gIndex = -1):
         if gIndex == -1: