this is my function who is returning all products list on my homepage, I want to define a condition to fetch only products with images comes first than products with no images comes last.

I am using magento2.2.0

 protected function _getAllProductProductCollection()     {         $  collection = $  this->productCollectionFactory->create();         $  collection->setVisibility($  this->catalogProductVisibility->getVisibleInCatalogIds());          $  collection = $  this->_addProductAttributesAndPrices($  collection)             ->addStoreFilter()             ->setPageSize($  this->getPageSize())             ->setCurPage($  this->getRequest()->getParam(self::PAGE_VAR_NAME, 1));          $  conditions = $  this->getConditions();         $  conditions->collectValidatedAttributes($  collection);         $  this->sqlBuilder->attachConditionToCollection($  collection, $  conditions);          return $  collection;     }