Import Dialog: log potential import errors to console and close dialog.

src/Journals/ImportDialog.tsx

@@ -108,6 +108,7 @@ class ImportDialog extends React.Component<PropsType> {
     reader.onabort = () => alert('file reading was aborted');
     reader.onerror = () => alert('file reading has failed');
     reader.onload = () => {
+      try {
         const fileText = reader.result as string;
         const items = itemsCreator(fileText);
 
@@ -134,6 +135,15 @@ class ImportDialog extends React.Component<PropsType> {
             this.props.onClose();
           }
         });
+      } catch (e) {
+        console.error(e);
+        alert('An error has occurred, please contact developers.');
+        if (this.props.onClose) {
+          this.setState({ loading: false });
+          this.props.onClose();
+        }
+        throw e;
+      }
     };
 
     this.setState({ loading: true });