#25911 Fix notice on incorrect price param

Author: ihor-sviziev

app/code/Magento/Catalog/Model/Layer/Filter/DataProvider/Price.php

@@ -310,7 +310,7 @@ public function validateFilter($filter)
             return false;
         }
         foreach ($filter as $v) {
-            if ($v !== '' && $v !== '0' && (double)$v <= 0 || is_infinite((double)$v)) {
+            if ($v !== '' && $v !== '0' && (!is_numeric($v) || (double)$v <= 0 || is_infinite((double)$v))) {
                 return false;
             }
         }

app/code/Magento/Catalog/Test/Unit/Model/Layer/Filter/DataProvider/PriceTest.php

@@ -178,6 +178,7 @@ public function validateFilterDataProvider()
             ['filter' => '0', 'result' => false],
             ['filter' => 0, 'result' => false],
             ['filter' => '100500INF', 'result' => false],
+            ['filter' => '-10\'[0]', 'result' => false],
         ];
     }