I think the best way to it via skip empty rows, follow below steps

1. add this use Maatwebsite\Excel\Concerns\SkipsEmptyRows; in your namespace
2. then implement in this manner class ParadeImport implements ToModel, WithHeadingRow, WithCalculatedFormulas, WithChunkReading, SkipsEmptyRows {}

I hope now you understand how you skip empty rows in maatwebsite package