twister: testplan: fix robot filter when there is no simulator

#79174 incorectly interpreted the condition. If no simulator is found
if cannot be "renode" and therefore robot should be considered unsupported.

Signed-off-by: Wilfried Chauveau <[email protected]>

Author: ithinuel

scripts/pylib/twister/twisterlib/testplan.py

@@ -947,7 +947,7 @@ def apply_filters(self, **kwargs):
 
                 if ts.harness:
                     sim = plat.simulator_by_name(self.options.sim_name)
-                    if ts.harness == 'robot' and sim and sim.name != 'renode':
+                    if ts.harness == 'robot' and not (sim and sim.name == 'renode'):
                         instance.add_filter("No robot support for the selected platform", Filters.SKIP)
 
                 if ts.depends_on: