fix: webviewer 入口文件修复无 pdfUrl 参数bug

packages/core/webviewer.js

@@ -81,6 +81,8 @@ class Viewer {
     let webviewerUrl = this.options.webviewerPath
     if (this.initialDoc) {
       webviewerUrl += "#d=".concat(this.initialDoc)
+    } else {
+      webviewerUrl += '#'
     }
     this.options.showToolbarControl !== undefined && (webviewerUrl += "&header=".concat(this.options.showToolbarControl ? "true": "false"))
     const iframe = document.createElement("iframe")