Fix #1286: Correct piexif library load validation

CHANGE.md

@@ -1,6 +1,12 @@
 Change Log: `bootstrap-fileinput`
 =================================
 
+## version 4.5.1
+
+**Date:** _under development_
+
+- (enh #1286): Correct piexif library load validation.
+
 ## version 4.5.0
 
 **Date:** 30-Aug-2018

js/fileinput.js

@@ -3159,10 +3159,9 @@
             return exifObj;
         },
         _validateImageOrientation: function ($img, file, previewId, caption, ftype, fsize, iData) {
-            var self = this, exifObj = self._getExifObj(iData), value = null;
-            if ($img.length && self.autoOrientImage && exifObj) {
-                value = exifObj["0th"][piexif.ImageIFD.Orientation]; // jshint ignore:line
-            }
+            var self = this, exifObj, value;
+            exifObj = $img.length && self.autoOrientImage ? self._getExifObj(iData) : null;
+            value = exifObj ? exifObj["0th"][piexif.ImageIFD.Orientation] : null; // jshint ignore:line
             if (!value) {
                 self._validateImage(previewId, caption, ftype, fsize, iData, exifObj);
                 return;