fix(page): fix AddPage not checking if the template actually existed.

pkg/svg/actions/page.go

@@ -2,6 +2,7 @@ package actions
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -15,6 +16,17 @@ import (
 const FILEFORMAT string = "%s-%d"
 
 func AddPage(id string, svgbuf []byte) (svg.TemplatePage, error) {
+
+	exists, err := database.Exists(id)
+
+	if err != nil {
+		return svg.TemplatePage{}, err
+	}
+
+	if !exists {
+		return svg.TemplatePage{}, errors.New("Template does not exist.")
+	}
+
 	data := svg.TemplatePage{TemplateId: id}
 	populateKeys(&data, svgbuf)