[ADF-788] fix error negative and zero value for max file size (#2590)

* fix error negative and zero value for max file size

* fix null scenario

ng2-components/ng2-alfresco-upload/src/components/upload-button.component.spec.ts

@@ -283,6 +283,22 @@ describe('UploadButtonComponent', () => {
             expect(filesCalledWith[0].name).toBe('smallFile.png');
         });
 
+        it('should filter out all files if maxFilesSize is 0', () => {
+            component.maxFilesSize = 0;
+
+            component.uploadFiles(files);
+
+            expect(addToQueueSpy.calls.mostRecent()).toBeUndefined();
+        });
+
+        it('should filter out all files if maxFilesSize is <0', () => {
+            component.maxFilesSize = -2;
+
+            component.uploadFiles(files);
+
+            expect(addToQueueSpy.calls.mostRecent()).toBeUndefined();
+        });
+
         it('should output an error when you try to upload a file too big', (done) => {
             component.maxFilesSize = 100;
 

ng2-components/ng2-alfresco-upload/src/components/upload-button.component.ts

@@ -225,7 +225,7 @@ export class UploadButtonComponent implements OnInit, OnChanges, NodePermissionS
     private isFileSizeAcceptable(file: FileModel): boolean {
         let acceptableSize = true;
 
-        if (this.maxFilesSize && file.size > this.maxFilesSize) {
+        if ((this.maxFilesSize !== undefined && this.maxFilesSize !== null ) && (this.maxFilesSize <= 0 || file.size > this.maxFilesSize)) {
             acceptableSize = false;
 
             this.translateService.get('FILE_UPLOAD.MESSAGES.EXCEED_MAX_FILE_SIZE', {fileName: file.name}).subscribe((message: string) => {