Fix tool crash

Fixes #282

Author: florianschanda

CHANGELOG.md

@@ -29,6 +29,9 @@ Not quite compatible with Octave yet. See #43 [octave support](https://github.co
 * Fix parser error for enumeration values with no parameters using
   brackets.
 
+* Fix tool crash when `--debug-dump-tree` was specified without
+  `--single`. This is now clear in the error message.
+
 * Add new configuration directive `ignore_dir`. This works just like
   `exclude_dir` but does not raise an error if the directory doesn't
   exist.

miss_hit_core/mh_style.py

@@ -3,7 +3,7 @@
 ##                                                                          ##
 ##          MATLAB Independent, Small & Safe, High Integrity Tools          ##
 ##                                                                          ##
-##              Copyright (C) 2019-2022, Florian Schanda                    ##
+##              Copyright (C) 2019-2024, Florian Schanda                    ##
 ##              Copyright (C) 2019-2020, Zenuity AB                         ##
 ##                                                                          ##
 ##  This file is part of MISS_HIT.                                          ##
@@ -1283,9 +1283,12 @@ def main_handler():
 
     # pylint: disable=consider-using-with
     if options.debug_dump_tree:
-        extra_options["fd_tree"] = open(options.debug_dump_tree,
-                                        "w",
-                                        encoding="UTF-8")
+        if options.single:
+            extra_options["fd_tree"] = open(options.debug_dump_tree,
+                                            "w",
+                                            encoding="UTF-8")
+        else:
+            clp["ap"].error("The debug_dump_tree requires the --single option")
     # pylint: enable=consider-using-with
 
     style_backend = MH_Style()