internal/relui/templates: correct task result rendering

Stop rendering the whole sql.NullString and instead render just the
string part.

Change-Id: I470d02330fad5d813f8dcf83317893163f17742e
Reviewed-on: https://go-review.googlesource.com/c/build/+/411200
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Alex Rakoczy <alex@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/internal/relui/templates/home.html b/internal/relui/templates/home.html
index 41f0bdf..75fd59c 100644
--- a/internal/relui/templates/home.html
+++ b/internal/relui/templates/home.html
@@ -95,7 +95,7 @@
                     {{$task.UpdatedAt.UTC.Format "Mon Jan _2 2006 15:04:05"}}
                   </td>
                   <td class="TaskList-itemCol TaskList-itemResult">
-                    {{$task.Result}}
+                    {{$task.Result.String}}
                   </td>
                   <td class="TaskList-itemCol TaskList-itemAction">
                     {{if $task.Error.Valid}}