FIX ENGINE-814: skip identities without key

sync/gen_statemachine.ysl2

@@ -691,6 +691,10 @@ tstylesheet {
                     message *_m = NULL;
                     char *_data = NULL;
                     
+                    // FIX ENGINE-814: skip identities without key
+                    if (EMPTYSTR(li->ident->fpr))
+                        continue;
+
                     _data = malloc(size);
                     assert(_data);
                     if (!_data) {