Check if file exists on FileStorage (php-debugbar#777)

Author: erikn69

src/DebugBar/DebugBar.php

@@ -386,7 +386,7 @@ public function getStackedData($delete = true)
             $datasets = $stackedData;
         }
 
-        return $datasets;
+        return array_filter($datasets);
     }
 
     /**

src/DebugBar/Storage/FileStorage.php

@@ -41,7 +41,12 @@ public function save($id, $data)
      */
     public function get($id)
     {
-        return json_decode(file_get_contents($this->makeFilename($id)), true);
+        $fileName = $this->makeFilename($id);
+        if (!file_exists($fileName)) {
+            return [];
+        }
+
+        return json_decode(file_get_contents($fileName), true);
     }
 
     /**