Merge master to develop

lib/features/label-editing/cmd/UpdateLabelHandler.js

@@ -44,7 +44,7 @@ export default function UpdateLabelHandler(modeling, textRenderer, bpmnFactory)
     }
 
     if (!text && di.label) {
-      di.label = null;
+      delete di.label;
     }
   }
 

test/spec/features/modeling/UpdateLabelSpec.js

@@ -247,7 +247,7 @@ describe('features/modeling - update label', function() {
 
       // then
       expect(task_2.businessObject.name).to.equal('');
-      expect(task_2.di.label).not.to.exist;
+      expect(task_2.di).not.to.have.property('label');
     }));
 
   });