Refactor: Add deserialization exception handling

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/database/EmbeddedDatabaseHandler.java

@@ -19,6 +19,7 @@ import org.h2gis.utilities.wrapper.DataSourceWrapper;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.InvalidClassException;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
@@ -191,6 +192,9 @@ public class EmbeddedDatabaseHandler {
                             }
                         });
                         return co;
+                    } catch (InvalidClassException | ClassCastException | SerializationException e){
+                        String msg = String.format("Deserialization of CityObject \"%s\" failed",id);
+                        logger.error(msg,e);
                     }
                 }
             } catch (IOException e) {