Issue #1589854: Check for file before marking for use.

fillpdf.module

@@ -365,10 +365,13 @@ function fillpdf_merge_pdf($fid, $nids = NULL, $webform_arr = NULL, $sample = NU
           $fields[$obj->pdf_key] = '{image}' . drupal_realpath($image_path);
           $image_path_info = pathinfo(drupal_realpath($image_path));
           // Store the image data to transmit to the remote service if necessary
-          $image_data[$obj->pdf_key] = array(
-            'data' => base64_encode(file_get_contents(drupal_realpath($image_path))),
-            'filenamehash' => md5($image_path_info['filename']) . '.' . $image_path_info['extension'],
-          );
+          $file_data = file_get_contents(drupal_realpath($image_path));
+          if ($file_data) {
+            $image_data[$obj->pdf_key] = array(
+              'data' => base64_encode($file_data),
+              'filenamehash' => md5($image_path_info['filename']) . '.' . $image_path_info['extension'],
+            );
+          }
         }
       }
       // /--- node token replacements ---