Recover better if we do not have a decompiler

Author: rocky

trepan/processor/command/deval.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-#  Copyright (C) 2017-2018, 2020-2021, 2023 Rocky Bernstein
+#  Copyright (C) 2017-2018, 2020-2021, 2023, 2025 Rocky Bernstein
 #
 #  This program is free software: you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
@@ -21,13 +21,20 @@
 
 from trepan.processor.command.base_cmd import DebuggerCommand
 
+have_decompiler = True
 if PYTHON_VERSION_TRIPLE >= (3, 9):
-    pass
+    have_decopmiler = False
 else:
-    if (3, 7) <= PYTHON_VERSION_TRIPLE:
-        from decompyle3.semantics.fragments import deparse_code, deparsed_find
-    else:
-        from uncompyle6.semantics.fragments import deparse_code, deparsed_find
+    have_decompiler = True
+    try:
+        if (3, 7) <= PYTHON_VERSION_TRIPLE:
+            from decompyle3.semantics.fragments import deparse_code, deparsed_find
+        else:
+            from uncompyle6.semantics.fragments import deparse_code, deparsed_find
+    except Exception:
+        have_decompiler = False
+
+if have_decompiler:
 
     class DEvalCommand(DebuggerCommand):
         """**deval**