added empty check

SchematicSystem_Main/src/de/steamwar/schematicsystem/commands/GUI.java

@@ -180,7 +180,7 @@ class GUI {
         inv.open();
     }
 
-    static void listSearch(Player player, String search) {
+    static boolean listSearch(Player player, String search) {
         List<Pair<SWItem, Schematic>> schemList = new LinkedList<>();
         List<Schematic> filteredSchems = new ArrayList<>();
 
@@ -189,6 +189,9 @@ class GUI {
                 filteredSchems.add(currentSchem);
         }
 
+        if(filteredSchems.isEmpty())
+            return false;
+
         for(Schematic currentSchem : filteredSchems) {
             Material m;
             if (currentSchem.getItem().isEmpty())
@@ -206,5 +209,6 @@ class GUI {
         }, schemList);
         inv.setCallback(-999, (ClickType click) -> player.closeInventory());
         inv.open();
+        return true;
     }
 }

SchematicSystem_Main/src/de/steamwar/schematicsystem/commands/SchematicCommand.java

@@ -334,11 +334,12 @@ public class SchematicCommand implements CommandExecutor {
     }
 
     private void search(Player player, String[] args) {
-        if(args.length != 1) {
+        if(args.length < 2) {
             help(player);
             return;
         }
-        GUI.listSearch(player, args[0]);
+        if(!GUI.listSearch(player, args[1]))
+            player.sendMessage("§cEs wurden keine Schematics gefunden!");
     }
 
     static void download(Player player, Schematic schematic){