Use try/finally to set stopped

Author: NoahStapp

test/asynchronous/helpers.py

@@ -403,5 +403,7 @@ def is_alive(self):
             return not self.stopped
 
     async def run(self):
-        await self.target(*self.args)
-        self.stopped = True
+        try:
+            await self.target(*self.args)
+        finally:
+            self.stopped = True

test/helpers.py

@@ -403,5 +403,7 @@ def is_alive(self):
             return not self.stopped
 
     def run(self):
-        self.target(*self.args)
-        self.stopped = True
+        try:
+            self.target(*self.args)
+        finally:
+            self.stopped = True