Feature/903 allow empty file uploads

client/js/uploader.api.js

@@ -326,7 +326,7 @@
 
             this._templating.updateProgress(id, loaded, total);
 
-            if (Math.round(loaded / total * 100) === 100) {
+            if (total === 0 || Math.round(loaded / total * 100) === 100) {
                 this._templating.hideCancel(id);
                 this._templating.hidePause(id);
                 this._templating.hideProgress(id);

client/js/uploader.basic.api.js

@@ -795,6 +795,10 @@
         },
 
         _formatSize: function(bytes) {
+            if (bytes === 0) {
+                return bytes + this._options.text.sizeSymbols[0];
+            }
+
             var i = -1;
             do {
                 bytes = bytes / 1000;
@@ -1797,7 +1801,7 @@
                 return validityChecker.failure();
             }
 
-            if (size === 0) {
+            if (!this._options.validation.allowEmpty && size === 0) {
                 this._itemError("emptyError", name, file);
                 return validityChecker.failure();
             }