Maybe fix http test when running on github

Author: AndyEveritt

src/dsf/http.py

@@ -140,7 +140,8 @@ def close(self):
         if self._loop is not None:
             # TODO: this enables correctly ending the loop. Why?
             self._loop.set_debug(True)
-            self._server.close()
+            if self._server is not None:
+                self._server.close()
             self._loop.stop()
         self.event_loop.cancel()
         self.executor.shutdown(wait=False)

tests/test_custom_http_endpoint.py

@@ -89,7 +89,7 @@ def test_custom_http_endpoint(self):
         # Wait for mock DCS server to complete
         self.server_thread.join(timeout=1)
 
-        time.sleep(0.1)
+        time.sleep(1)
 
         if endpoint is not None:
             endpoint.close()