The skipping of items without a relevant path was failing to pick ite…

…ms with the final element set to None. Now we skip whenever the final element in the path is None. (#26328)

Depending on the exact test setup, paths, including ones that initially come back as `[ None ]`
because the application does not exist, can end up with a prefix (e.g. to run the application
in a network namespace on Linux), so we can't rely on missing applications being represented
by a single-element list.

scripts/tests/chiptest/test_definition.py

@@ -283,7 +283,7 @@ def Run(self, runner, apps_register, paths: ApplicationPaths, pics_file: str,
                 # happen if the relevant application does not exist.  It's
                 # non-fatal as long as we are not trying to run any tests that
                 # need that application.
-                if len(path) == 1 and path[0] is None:
+                if path[-1] is None:
                     continue
 
                 # For the app indicated by self.target, give it the 'default' key to add to the register