remove more ternaries

pages/dashboard.tsx

@@ -60,11 +60,11 @@ export default function Dashboard() {
     handleNumberOfLinksToShow();
   }, [width]);
 
-  const importBookmarks = async (e: any, format: MigrationFormat) => {
-    const file: File = e.target.files[0];
+  const importBookmarks = async (e: React.ChangeEvent<HTMLInputElement>, format: MigrationFormat) => {
+    const file: File | null = e.target.files && e.target.files[0];
 
     if (file) {
-      var reader = new FileReader();
+      const reader = new FileReader();
       reader.readAsText(file, "UTF-8");
       reader.onload = async function (e) {
         const load = toast.loading("Importing...");
@@ -81,7 +81,7 @@ export default function Dashboard() {
           body: JSON.stringify(body),
         });
 
-        const data = await response.json();
+        await response.json();
 
         toast.dismiss(load);