Recover from non-readable images

Classes/PHPExcel/Reader/Excel5.php

@@ -1065,7 +1065,14 @@ public function load($pFilename)
 
                             // need check because some blip types are not supported by Escher reader such as EMF
                             if ($blip = $BSE->getBlip()) {
-                                $ih = imagecreatefromstring($blip->getData());
+
+                                // check if we can actually create the image... no support for bmp
+                                try {
+                                    $ih = imagecreatefromstring($blip->getData());
+                                } catch (Exception $exception) {
+                                    break;
+                                }
+
                                 $drawing = new PHPExcel_Worksheet_MemoryDrawing();
                                 $drawing->setImageResource($ih);