fix check url on shutdown sessions test

Author: asmyasnikov

test/table_test.go

@@ -608,10 +608,13 @@ func TestTable(t *testing.T) {
 	t.Run("SessionsShutdown", func(t *testing.T) {
 		urls := strings.Split(os.Getenv("YDB_SHUTDOWN_URLS"), ",")
 		for _, url := range urls {
-			// nolint:gosec
-			_, err := http.Get(url)
-			if err != nil {
-				t.Fatalf("failed to send request: %v", err)
+			url = strings.TrimSpace(url)
+			if len(url) > 0 {
+				// nolint:gosec
+				_, err := http.Get(url)
+				if err != nil {
+					t.Fatalf("failed to send request: %v", err)
+				}
 			}
 		}
 		if len(urls) > 0 {