don't remove global parsing errors on checking

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/CheckError.java

@@ -83,4 +83,8 @@ public interface CheckError extends Serializable {
 	 */
 	public void report(ErrorReport report);
 
+	public default boolean isParsingError() {
+		return false;
+	}
+
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/CheckResult.java

@@ -71,8 +71,4 @@ public class CheckResult implements Serializable {
         return String.format("CheckResult [id=%s, status=%s, error=%s]", id, status, err);
 	}
 
-	public boolean isParsingError() {
-		return false;
-	}
-
 }

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Checkable.java

@@ -224,7 +224,7 @@ public abstract class Checkable implements Serializable {
 	 * Clears the checkResults of this checkable unless the error occured during parsing.
 	 */
 	public void clearCheckResults() {
-		checkResults.entrySet().removeIf(e -> !e.getValue().isParsingError());
+		checkResults.entrySet().removeIf(e -> !e.getValue().getError().isParsingError());
 		setValidated(!checkResults.isEmpty());
 	}
 

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/error/XMLValidationError.java

@@ -55,5 +55,10 @@ public class XMLValidationError implements CheckError {
 	public void report(ErrorReport report) {
 		report.add("message", message);
 	}
+	
+	@Override
+	public boolean isParsingError() {
+		return true;
+	}
 
 }

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

@@ -700,7 +700,8 @@ public class Checker {
 
         AtomicInteger checkedCount = new AtomicInteger(0);
         // clear global errors
-        model.getGlobalErrors().clear();
+        model.getGlobalErrors().removeIf(e -> !e.isParsingError());
+        
         CityObjectCache cache = model.getCache();
         logger.trace("Setting up ThreadPool");
         int threadCount = Runtime.getRuntime().availableProcessors() * 5;