fix bug with evaluator toolbar when the evaluation is cancelled

src/dtkComposer/dtkComposerEvaluatorToolBar.cpp

@@ -115,6 +115,7 @@ void dtkComposerEvaluatorToolBar::setComposerWidget(dtkComposerWidget *composer)
     d->composer = composer;
     connect(d->run_action, SIGNAL(triggered()), this, SLOT(onEvaluatorStarted()));
     connect(d->composer->evaluator(), SIGNAL(evaluationStopped()), this, SLOT(onEvaluatorFinished()));
+    connect(d->composer, SIGNAL(evaluationStopped()), this, SLOT(onEvaluatorFinished()));
     connect(d->composer->evaluator(), SIGNAL(evaluationPaused(dtkComposerGraphNode*)), this, SLOT(onEvaluatorPaused(dtkComposerGraphNode*)));
 
     connect(d->step_action, SIGNAL(triggered()), d->composer, SLOT(step()));

src/dtkComposer/dtkComposerWidget.cpp

@@ -244,6 +244,8 @@ void dtkComposerWidget::run(void)
 
     if (d->scene->checkImplementations()) {
         QtConcurrent::run(d->evaluator, &dtkComposerEvaluator::run, false);
+    } else {
+        emit evaluationStopped();
     }
 }