core: user_import: check existance

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.12.26",
+  "version": "4.12.27",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
@@ -44,7 +44,7 @@
     "diff-dom": "^4.2.2",
     "echarts": "^5.1.2",
     "emojify.js": "^1.1.0",
-    "eslint": "^7.30.0",
+    "eslint": "^7.31.0",
     "eslint-config-airbnb": "^18.2.1",
     "eslint-import-resolver-webpack": "^0.13.1",
     "eslint-plugin-babel": "^5.3.1",
@@ -68,7 +68,7 @@
     "jquery.transit": "^0.9.12",
     "mini-css-extract-plugin": "^1.6.2",
     "moment": "^2.29.1",
-    "monaco-editor": "^0.26.0",
+    "monaco-editor": "^0.26.1",
     "monaco-editor-webpack-plugin": "^4.1.1",
     "nanoid": "^3.1.23",
     "normalize.css": "^8.0.1",
@@ -77,7 +77,7 @@
     "pickadate": "^3.6.4",
     "plugin-error": "^1.0.1",
     "postcss-loader": "^3.0.0",
-    "prism-themes": "^1.7.0",
+    "prism-themes": "^1.8.0",
     "prismjs": "^1.24.1",
     "prop-types": "^15.7.2",
     "react": "^17.0.2",