[11.x] Fix handling exceptions thrown in eval()'d code

Author: jlabedo

src/Illuminate/Foundation/Exceptions/Renderer/Frame.php

@@ -106,6 +106,9 @@ public function file()
      */
     public function line()
     {
+        if (! (\is_file($this->frame['file']) && is_readable($this->frame['file']))) {
+            return 0;
+        }
         $maxLines = count(file($this->frame['file']) ?: []);
 
         return $this->frame['line'] > $maxLines ? 1 : $this->frame['line'];
@@ -131,6 +134,9 @@ public function callable()
      */
     public function snippet()
     {
+        if (! (\is_file($this->frame['file']) && is_readable($this->frame['file']))) {
+            return '';
+        }
         $contents = file($this->frame['file']) ?: [];
 
         $start = max($this->line() - 6, 0);