Adds checking of template error

go/src/infra/tricium/service/common/common.go

Index: go/src/infra/tricium/service/common/common.go
diff --git a/go/src/infra/tricium/service/common/common.go b/go/src/infra/tricium/service/common/common.go
new file mode 100644
index 0000000000000000000000000000000000000000..c0dab311006733dad5e3d7398a3e738b81077d25
--- /dev/null
+++ b/go/src/infra/tricium/service/common/common.go
@@ -0,0 +1,27 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Package common implements common functionality for the Tricium service modules.
+package common
+
+import (
+	"fmt"
+	"html/template"
+	"net/http"
+)
+
+var basePage = template.Must(template.ParseFiles("templates/base.html"))
+
+// ShowBasePage executes the base page template
+func ShowBasePage(w http.ResponseWriter, d interface{}) {
+	executeTemplate(basePage, w, d)
+}
+
+func executeTemplate(t *template.Template, w http.ResponseWriter, d interface{}) error {
+	if err := t.Execute(w, d); err != nil {
+		http.Error(w, "Internal server error. We are working on it.", http.StatusInternalServerError)
+		return fmt.Errorf("Error executing template: %v", err)

[nodir, 2016/07/15 16:38:23]

error messages should not start with  a capital letter, because it is typical to
prepend more context text to an error message, like here for example

[emso, 2016/07/19 08:38:44]

Done.

+	}
+	return nil
+}