Don't immediately fail on PlayContext setup

As we may end up skipping the task due to conditionals.

Fixes #12774

lib/ansible/executor/task_executor.py

@@ -259,17 +259,24 @@ class TaskExecutor:
 
         templar = Templar(loader=self._loader, shared_loader_obj=self._shared_loader_obj, variables=variables)
 
-        # apply the given task's information to the connection info,
-        # which may override some fields already set by the play or
-        # the options specified on the command line
-        self._play_context = self._play_context.set_task_and_variable_override(task=self._task, variables=variables, templar=templar)
-
-        # fields set from the play/task may be based on variables, so we have to
-        # do the same kind of post validation step on it here before we use it.
-        # We also add "magic" variables back into the variables dict to make sure
-        # a certain subset of variables exist.
-        self._play_context.update_vars(variables)
-        self._play_context.post_validate(templar=templar)
+        context_validation_error = None
+        try:
+            # apply the given task's information to the connection info,
+            # which may override some fields already set by the play or
+            # the options specified on the command line
+            self._play_context = self._play_context.set_task_and_variable_override(task=self._task, variables=variables, templar=templar)
+
+            # fields set from the play/task may be based on variables, so we have to
+            # do the same kind of post validation step on it here before we use it.
+            self._play_context.post_validate(templar=templar)
+
+            # We also add "magic" variables back into the variables dict to make sure
+            # a certain subset of variables exist.
+            self._play_context.update_vars(variables)
+        except AnsibleError as e:
+            # save the error, which we'll raise later if we don't end up
+            # skipping this task during the conditional evaluation step
+            context_validation_error = e
 
         # Evaluate the conditional (if any) for this task, which we do before running
         # the final task post-validation. We do this before the post validation due to
@@ -284,6 +291,10 @@ class TaskExecutor:
             if self._task.action != 'include':
                 raise
 
+        # if we ran into an error while setting up the PlayContext, raise it now
+        if context_validation_error is not None:
+            raise context_validation_error
+
         # if this task is a TaskInclude, we just return now with a success code so the
         # main thread can expand the task list for the given host
         if self._task.action == 'include':