do not ask the api for attachments when nothing changes

Signed-off-by: Florian Kraft <f.kraft@finn.de>

frontend/app/services/conversion-service.js

@@ -48,7 +48,7 @@ module.exports = function() {
       if (bytes > 1000000) {
         return ConversionService.megabytes(bytes) + 'MB';
       }
-      return bytes + 'B'
+      return bytes + 'B';
     }
   };
 

frontend/app/work_packages/directives/work-package-attachments-directive.js

@@ -40,9 +40,12 @@ module.exports = function(
 
     var workPackage = scope.workPackage(),
         upload = function(event, workPackage) {
-          workPackageAttachmentsService.upload(workPackage, scope.files).then(function() {
-            scope.files = [];
-          }).finally(loadAttachments);
+          if (scope.files.length > 0) {
+            workPackageAttachmentsService.upload(workPackage, scope.files).then(function() {
+              scope.files = [];
+              loadAttachments()
+            });
+          };
         },
         loadAttachments = function() {
           if (!editMode(attrs)) {

frontend/app/work_packages/services/work-package-attachments-service.js

@@ -87,7 +87,7 @@ module.exports = function(Upload, PathHelper, I18n, NotificationsService, $q, $t
       removal.resolve(fileOrAttachment);
     }
     return removal.promise;
-  }
+  };
 
   return {
     upload: upload,