Fix zerobytesfileupload

CHANGE.md

@@ -5,6 +5,7 @@ Change Log: `bootstrap-fileinput`
 
 **Date**: _under development_
 
+- (enh #1879): Correct getTotalChunks to return valid count even if 0 byte file
 - (enh #1878): Correct rotated images behavior in zoom modal dialog.
 - (enh #1876): Correct variable initialization for folder drag & drop.
 - (enh #1875): Correct locale language fallback if unspecified.
@@ -1679,4 +1680,4 @@ Initial release. The following features are included in this release:
 - Upload action defaults to form submit. Supports an upload route/server action parameter for custom ajax based upload.
 - Triggers JQuery events for advanced development. Events currently available are `filereset` and `fileclear`.
 - Disabled and readonly file input support.
-- Size of the entire plugin is less than 11KB (about 9KB for the minified JS and 2KB for the minified CSS).
+- Size of the entire plugin is less than 11KB (about 9KB for the minified JS and 2KB for the minified CSS).

js/fileinput.js

@@ -1564,7 +1564,7 @@
         getTotalChunks: function () {
           var chunkSize = parseFloat(rm.chunkSize);
           if (!isNaN(chunkSize) && chunkSize > 0) {
-            return Math.ceil(rm.file.size / chunkSize);
+            return rm.file.size === 0 ? 1 : Math.ceil(rm.file.size / chunkSize); //even if file size is 0, totalChunk will be 1
           }
           return 0;
         },