The missing static directory shouldn't fail the build

The lack of the directory would be worth to warn, since the directory is
created by "huge new site". But it doesn't have to fail the build.

This change fixes #759.

commands/hugo.go

@@ -328,12 +328,6 @@ func build(watches ...bool) {
 }
 
 func copyStatic() error {
-	staticDir := helpers.AbsPathify(viper.GetString("StaticDir")) + "/"
-	if _, err := os.Stat(staticDir); os.IsNotExist(err) {
-		jww.ERROR.Println("Unable to find Static Directory:", staticDir)
-		return nil
-	}
-
 	publishDir := helpers.AbsPathify(viper.GetString("PublishDir")) + "/"
 
 	syncer := fsync.NewSyncer()
@@ -347,15 +341,21 @@ func copyStatic() error {
 		return nil
 	}
 
+	// Copy the theme's static directory
 	if themeDir != "" {
-		// Copy Static to Destination
 		jww.INFO.Println("syncing from", themeDir, "to", publishDir)
 		utils.CheckErr(syncer.Sync(publishDir, themeDir), fmt.Sprintf("Error copying static files of theme to %s", publishDir))
 	}
 
-	// Copy Static to Destination
-	jww.INFO.Println("syncing from", staticDir, "to", publishDir)
-	return syncer.Sync(publishDir, staticDir)
+	// Copy the site's own static directory
+	staticDir := helpers.AbsPathify(viper.GetString("StaticDir")) + "/"
+	if _, err := os.Stat(staticDir); err == nil {
+		jww.INFO.Println("syncing from", staticDir, "to", publishDir)
+		return syncer.Sync(publishDir, staticDir)
+	} else if os.IsNotExist(err) {
+		jww.WARN.Println("Unable to find Static Directory:", staticDir)
+	}
+	return nil
 }
 
 // getDirList provides NewWatcher() with a list of directories to watch for changes.