Fix AbstractLinker

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/BauSystem.java

@@ -124,6 +124,7 @@ public class BauSystem extends JavaPlugin implements Listener {
         } catch (AbstractLinker.LinkException e) {
             getLogger().log(Level.SEVERE, "Could not link a class.", e);
             Bukkit.shutdown();
+            return;
         }
 
         TickListener.impl.init();

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/features/tracer/TraceManager.java

@@ -45,8 +45,6 @@ public class TraceManager implements Listener {
         instance = this;
     }
 
-
-
     public void init() {
         if (!tracesFolder.exists())
             tracesFolder.mkdir();

CommonCore/Linkage/src/de/steamwar/linkage/AbstractLinker.java

@@ -56,7 +56,9 @@ public abstract class AbstractLinker<T> {
                     .map(s -> {
                         try {
                             return Class.forName(s, false, plugin.getClass().getClassLoader());
-                        } catch (ClassNotFoundException | NoClassDefFoundError e) {
+                        } catch (NoClassDefFoundError error) {
+                            return null;
+                        } catch (ClassNotFoundException e) {
                             throw new SecurityException(e.getMessage(), e);
                         }
                     })