scripts: twister: Process KeyboardInterrupt Hardening

If you interrupt process() operation, we want Twister
to exit as gracefully as it can. This avoids the
UnboundLocalError that could appear e.g.
when interrupting the operation via SIGINT.

Signed-off-by: Lukasz Mrugala <[email protected]>

Author: LukaszMrugala

scripts/pylib/twister/twisterlib/runner.py

@@ -615,6 +615,9 @@ def _add_to_pipeline(self, pipeline, op: str, additionals: dict={}):
 
 
     def process(self, pipeline, done, message, lock, results):
+        next_op = None
+        additionals = {}
+
         op = message.get('op')
 
         self.instance.setup_handler(self.env)
@@ -772,8 +775,6 @@ def process(self, pipeline, done, message, lock, results):
                     done.put(self.instance)
                     self.report_out(results)
 
-                next_op = None
-                additionals = {}
                 if not self.options.coverage:
                     if self.options.prep_artifacts_for_testing:
                         next_op = 'cleanup'