fix json handling

import_api_app/resources/WriteJobResultsToDrupal.py

@@ -113,6 +113,7 @@ def write_results(job_drupal_uuid, job_log_drupal_uuid, status, report):
     # read "status" and "message" from log_result
     previous_status = ''
     previous_report = ''
+    previous_report_json = ''
     step = ''
     try:
         getUrl = current_app.config['drupal-api-url'] + \
@@ -129,10 +130,12 @@ def write_results(job_drupal_uuid, job_log_drupal_uuid, status, report):
     if previous_status == 'FAILED':
         status = previous_status
     if previous_report is None:
-        previous_report = {}
+        previous_report_json = {}
+    else:
+        previous_report_json = json.loads(previous_report)
     step = report['step']
-    previous_report[step] = report
-    reportString = json.dumps(previous_report, indent=2)
+    previous_report_json[step] = report
+    reportString = json.dumps(previous_report)
 
     # update values in drupal:
     patchCalls = {}