fix(core): update

ts/tsbundle.htmlhandler.ts

@@ -5,8 +5,15 @@ export class HtmlHandler {
   public sourceFilePath: string = plugins.path.join(paths.htmlDir, 'index.html');
   public targetFilePath: string = plugins.path.join(paths.distWebDir, 'index.html');
 
+  public async checkIfExists () {
+    return plugins.smartfile.fs.fileExists(this.sourceFilePath);
+  }
+
   // copies the html
   public async copyHtml() {
+    if (!(await this.checkIfExists)) {
+      return;
+    }
     await plugins.smartfile.fs.copy(
       this.sourceFilePath,
       this.targetFilePath
@@ -15,6 +22,9 @@ export class HtmlHandler {
 
   // copies and minifies the html
   public async minifyHtml() {
+    if (!(await this.checkIfExists)) {
+      return;
+    }
     const fileString = plugins.smartfile.fs.toStringSync(this.sourceFilePath);
     const minifiedHtml = plugins.htmlMinifier.minify(fileString, {
       minifyCSS: true,