autotest: correct sub gripper mission

Ordinarily not run because gripper is disabled

Tools/autotest/ardusub.py

@@ -267,30 +267,19 @@ class AutoTestSub(AutoTest):
         self.progress("Mission OK")
 
     def test_gripper_mission(self):
-        with self.Context(self):
-            self.test_gripper_body()
-
-    def test_gripper_body(self):
-        ex = None
         try:
-            try:
-                self.get_parameter("GRIP_ENABLE", timeout=5)
-            except NotAchievedException:
-                self.progress("Skipping; Gripper not enabled in config?")
-                return
+            self.get_parameter("GRIP_ENABLE", timeout=5)
+        except NotAchievedException:
+            self.progress("Skipping; Gripper not enabled in config?")
+            return
 
-            self.load_mission("sub-gripper-mission.txt")
-            self.change_mode('LOITER')
-            self.wait_ready_to_arm()
-            self.arm_vehicle()
-            self.change_mode('AUTO')
-            self.wait_statustext("Gripper Grabbed", timeout=60)
-            self.wait_statustext("Gripper Released", timeout=60)
-        except Exception as e:
-            self.print_exception_caught(e)
-            ex = e
-        if ex is not None:
-            raise ex
+        self.load_mission("sub-gripper-mission.txt")
+        self.change_mode('LOITER')
+        self.wait_ready_to_arm()
+        self.arm_vehicle()
+        self.change_mode('AUTO')
+        self.wait_statustext("Gripper Grabbed", timeout=60)
+        self.wait_statustext("Gripper Released", timeout=60)
 
     def dive_set_position_target(self):
         self.change_mode('GUIDED')