Style: Make progressbar indeterminate during Schematron

CityDoctorParent/CityDoctorValidation/src/main/java/de/hft/stuttgart/citydoctor2/check/Checker.java

@@ -204,6 +204,9 @@ public class Checker {
         }
         if (schematronThread.isAlive()) {
             logger.info(Localization.getText("Checker.schematronStillRunning"));
+            if(l !=null){
+                l.updateProgress(-0.5f);
+            }
             try{
                 schematronThread.join();
                 logger.info(Localization.getText("Checker.schematronCompleted"));

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/CheckDialog.java

@@ -11,6 +11,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
+import de.hft.stuttgart.citydoctor2.parser.ProgressListener;
 import javafx.beans.value.ChangeListener;
 import javafx.beans.value.ObservableValue;
 import javafx.scene.control.Alert;
@@ -450,7 +451,13 @@ public class CheckDialog {
 						String startingChecks = Localization.getText("CheckDialog.startingChecks");
 						logger.info(startingChecks);
 					}
-					controller.startChecks(config, progress::setProgress);
+					ProgressListener l = new ProgressListener() {
+						@Override
+						public void updateProgress(float state) {
+							Platform.runLater(() -> progress.setProgress(state));
+						}
+					};
+					controller.startChecks(config, l);
 
 					if (logger.isInfoEnabled()) {
 						String checksDone = Localization.getText("CheckDialog.checksDone");