Fix nullpointer in RCursor

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/utils/cursor/RCursor.java

@@ -44,7 +44,8 @@ public class RCursor {
 
         RayTraceUtils.RRayTraceResult rayTraceResult = RayTraceUtils.traceREntity(owner, owner.getLocation(), targetServer.getEntities());
         if (rayTraceResult == null) {
-            cursorEntity.die();
+            if(cursorEntity != null) cursorEntity.die();
+            cursorEntity = null;
             return;
         }
 
@@ -58,12 +59,15 @@ public class RCursor {
         if (cursorEntity == null) {
             cursorEntity = new RFallingBlockEntity(targetServer, activeCursorLocation, activeCursorMaterial);
             cursorEntity.setNoGravity(true);
-        } else if (cursorEntity.getMaterial() == activeCursorMaterial) {
+        } if (cursorEntity.getMaterial() == activeCursorMaterial) {
             cursorEntity.move(activeCursorLocation);
         } else {
             cursorEntity.die();
             cursorEntity = new RFallingBlockEntity(targetServer, activeCursorLocation, activeCursorMaterial);
             cursorEntity.setNoGravity(true);
+            if(activeCursorMaterial == highlightMaterial) {
+                cursorEntity.setGlowing(true);
+            }
         }
     }
 
@@ -71,6 +75,7 @@ public class RCursor {
         visible = false;
         if (cursorEntity != null) {
             cursorEntity.die();
+            cursorEntity = null;
         }
     }