better error message if instance fails

diff --git a/camunda-overlay/camunda.py b/camunda-overlay/camunda.py
index 070603983bae43807ac62da0ee18417bda6da27a..65ad271d3e74ac9e130f4bea08093ecd54ba8305 100755 (executable)
--- a/camunda-overlay/camunda.py
+++ b/camunda-overlay/camunda.py
@@ -86,6 +86,9 @@ def submit_terms(terms):
 
 def download_pdf():
     instances = get_current_process_instances()
+    if len(instances) == 0:
+        print ("Error: no running instance found.")
+        return
     instance = instances[0]['id']
     res = requests.get(CAMUNDA + 'process-instance/' + instance + '/variables')
     try: