Skips empty rows concern docs (SpartnerNL#137)

* Add SkipsEmptyRows concern

* Add Skipping empty rows block

for the SkipsEmptyRows concern

Author: SanderMuller

3.1/imports/concerns.md

@@ -24,6 +24,7 @@ pageClass: no-toc
 |`Maatwebsite\Excel\Concerns\WithStartRow`| Define a custom start row. | |
 |`Maatwebsite\Excel\Concerns\WithProgressBar`| Shows a progress bar when uploading via the console. | [Progress Bar](/3.1/imports/progress-bar.html) |
 |`Maatwebsite\Excel\Concerns\WithValidation`| Validates each row against a set of rules. | [Row Validation](/3.1/imports/validation.html) |
+|`Maatwebsite\Excel\Concerns\SkipsEmptyRows`| Skips empty rows. | [Row Validation](/3.1/imports/validation.html#skipping-empty-rows) |
 |`Maatwebsite\Excel\Concerns\SkipsOnFailure`| Skips on validation errors. | [Row Validation](/3.1/imports/validation.html#skipping-failures) |
 |`Maatwebsite\Excel\Concerns\SkipsOnError`| Skips on database exceptions. | [Row Validation](/3.1/imports/validation.html#skipping-errors) |
 |`Maatwebsite\Excel\Concerns\WithColumnLimit` | Allows setting an end column ||

3.1/imports/validation.md

@@ -272,6 +272,38 @@ foreach ($import->failures() as $failure) {
 }
 ```
 
+## Skipping empty rows
+
+Sometimes you might want to skip empty rows, for example when using the `required` validation rule. By using the `SkipsEmptyRows` concern, empty rows will get skipped during both validation **and the import**.
+
+```php
+<?php
+
+namespace App\Imports;
+
+use App\User;
+use Maatwebsite\Excel\Concerns\Importable;
+use Maatwebsite\Excel\Concerns\SkipsEmptyRows;
+use Maatwebsite\Excel\Concerns\ToModel;
+use Maatwebsite\Excel\Concerns\WithHeadingRow;
+use Maatwebsite\Excel\Concerns\WithValidation;
+
+class UsersImport implements ToModel, SkipsEmptyRows, WithHeadingRow, WithValidation
+{
+    use Importable;
+    
+    public function rules(): array
+    {
+        return [
+            'name' => [
+                'required',
+                'string',
+            ],
+        ];
+    }
+}
+```
+
 ### Skipping errors
 
 Sometimes you might want to skip **all** errors, e.g. duplicate database records. By using the `SkipsOnError` concern, you get control over what happens the moment a model import fails.