Add an attribute check

asn1_value_editor/Scenario.py

@@ -59,9 +59,13 @@ class Scenario(QThread, object):
                 try:
                     mod = importlib.import_module(backend + '_backend')
                 except ImportError:
-                    self.log.put((self.name, 'ERROR',
-                                  'Could not import {b}_backend.py'
-                                  .format(b=backend)))
+                    try:
+                        self.log.put((self.name, 'ERROR',
+                                      'Could not import {b}_backend.py'
+                                      .format(b=backend)))
+                    except AttributeError:
+                        print("ERROR: could not import {}_backend.py"
+                                .format(backend))
                     continue
             mod.setMsgQ()
             # set the ASN.AST into the backend module, needed to convert VN