try/catch

apps/remix-ide/src/app/ui/landing-page/landing-page.js

@@ -298,24 +298,30 @@ export class LandingPage extends ViewPlugin {
     }
 
     const downloadFiles = async () => {
-      const fileProviders = globalRegistry.get('fileproviders').api
-      const json = await fileProviders.browser.copyFolderToJson('/')
+      try {
+        const fileProviders = globalRegistry.get('fileproviders').api
+        const json = await fileProviders.browser.copyFolderToJson('/')
+        const blob = new Blob([ JSON.stringify(json, null, '\t') ], { type: 'text/plain;charset=utf-8' })
       const blob = new Blob([ JSON.stringify(json, null, '\t') ], { type: 'text/plain;charset=utf-8' })    
-      const node = document.createElement('a')
-      node.download = 'remix.json'
-      node.rel = 'noopener'
-      node.href = URL.createObjectURL(blob)
-      setTimeout(function () { URL.revokeObjectURL(a.href) }, 4E4) // 40s
-      setTimeout(function () {
-        try {
-          node.dispatchEvent(new MouseEvent('click'))
-        } catch (e) {
-          var evt = document.createEvent('MouseEvents')
-          evt.initMouseEvent('click', true, true, window, 0, 0, 0, 80,
-                                20, false, false, false, false, 0, null)
-          node.dispatchEvent(evt)
-        }
-      }, 0) // 40s
+        const blob = new Blob([ JSON.stringify(json, null, '\t') ], { type: 'text/plain;charset=utf-8' })
+        const node = document.createElement('a')
+        node.download = 'remix.json'
+        node.rel = 'noopener'
+        node.href = URL.createObjectURL(blob)
+        setTimeout(function () { URL.revokeObjectURL(a.href) }, 4E4) // 40s
+        setTimeout(function () {
+          try {
+            node.dispatchEvent(new MouseEvent('click'))
+          } catch (e) {
+            var evt = document.createEvent('MouseEvents')
+            evt.initMouseEvent('click', true, true, window, 0, 0, 0, 80,
+                                  20, false, false, false, false, 0, null)
+            node.dispatchEvent(evt)
+          }
+        }, 0) // 40s
+      } catch (e) {
+        tooltip(e.message)
+      }
     }
 
     const uploadFile = (target) => {