Hotfix 1.15 send in not possible

Signed-off-by: Lixfel <agga-games@gmx.de>

SchematicSystem_15/src/de/steamwar/schematicsystem/CheckSchemType_15.java

@@ -100,7 +100,7 @@ class CheckSchemType_15 {
                     final BaseBlock block = clipboard.getFullBlock(BlockVector3.at(x, y, z));
                     final Material blockMaterial = Material.matchMaterial(block.getBlockType().getId());
                     if(blockMaterial == null)
-                        throw new SecurityException("Unknown material, please resolve " + block.getBlockType().getName() + " " + block.getBlockType().getId());
+                        continue;
 
                     result.checkMaterial(blockMaterial.name());