[Fix] Remove all Scenarios, catch empty SMILES, prevent default Package delete (#134)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#134

tests/views/test_rule_views.py

@@ -161,7 +161,8 @@ class RuleViewTest(TestCase):
                 'package_uuid': str(r.package.uuid),
                 'rule_uuid': str(r.uuid)
             }), {
-                "selected-scenarios": []
+                # We have to set an empty string to avoid that the parameter is removed
+                "selected-scenarios": ""
             }
         )